diff --git a/ChangeLog.txt b/ChangeLog.txt
index 1a9f6e1af..26c0ceab2 100644
--- a/ChangeLog.txt
+++ b/ChangeLog.txt
@@ -1,6 +1,7 @@
 # Version 0.7.45 (unreleased)
 - Fix incorrect seam allowance for angle type second edge right angle.
 - Fix regression with country flags.
+- Fix bug in seam allowance.
 
 # Version 0.7.44 Feb 9, 2021
 - Placeholder %size% has incorrect value.
diff --git a/src/app/share/collection/bugs/smart_pattern_#36.val b/src/app/share/collection/bugs/smart_pattern_#36.val
index 8b8188aff..1b3691a36 100644
--- a/src/app/share/collection/bugs/smart_pattern_#36.val
+++ b/src/app/share/collection/bugs/smart_pattern_#36.val
@@ -17,7 +17,7 @@
     <finalMeasurements/>
     <measurements>smart_pattern_#36.vit</measurements>
     <increments>
-        <increment description="" formula="29&#10;+#stojka_shyrina_shva_snizu&#10;+ #stojka_shyrina_shva_sverxu" name="#model_stojka_shyrina"/>
+        <increment description="" formula="29" name="#model_stojka_shyrina"/>
     </increments>
     <previewCalculations/>
     <draw name="Стойка">
diff --git a/src/libs/vgeometry/vgeometrydef.h b/src/libs/vgeometry/vgeometrydef.h
index bd533ae30..fc59a9a36 100644
--- a/src/libs/vgeometry/vgeometrydef.h
+++ b/src/libs/vgeometry/vgeometrydef.h
@@ -97,7 +97,7 @@ private:
 };
 Q_DECLARE_METATYPE(VLayoutPassmark)
 
-constexpr qreal accuracyPointOnLine = (0.117/*mm*/ / 25.4) * PrintDPI;
+constexpr qreal accuracyPointOnLine = (0.126/*mm*/ / 25.4) * PrintDPI;
 
 Q_REQUIRED_RESULT static inline bool VFuzzyComparePoints(const QPointF &p1, const QPointF &p2,
                                                          qreal accuracy = accuracyPointOnLine);
diff --git a/src/test/ValentinaTest/share/DP_6/output.json b/src/test/ValentinaTest/share/DP_6/output.json
index 5b5005334..1687c20f1 100644
--- a/src/test/ValentinaTest/share/DP_6/output.json
+++ b/src/test/ValentinaTest/share/DP_6/output.json
@@ -210,11 +210,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_right_angle/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_right_angle/output.json
index 35cd3b2d3..e58994553 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_right_angle/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_right_angle/output.json
@@ -380,11 +380,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_symmetry/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_symmetry/output.json
index c7ab68373..9f9c2f886 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_symmetry/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_first_edge_symmetry/output.json
@@ -370,11 +370,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_intersection/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_intersection/output.json
index c7ab68373..9f9c2f886 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_intersection/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_intersection/output.json
@@ -370,11 +370,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_length/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_length/output.json
index c7ab68373..9f9c2f886 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_length/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_length/output.json
@@ -370,11 +370,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_right_angle/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_right_angle/output.json
index c7ab68373..9f9c2f886 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_right_angle/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_right_angle/output.json
@@ -370,11 +370,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_symmetry/output.json b/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_symmetry/output.json
index c7ab68373..9f9c2f886 100644
--- a/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_symmetry/output.json
+++ b/src/test/ValentinaTest/share/DP_6_hem_by_second_edge_symmetry/output.json
@@ -370,11 +370,6 @@
             "x": 2655.688340739313,
             "y": 1707.7165018577969
         },
-        {
-            "type": "QPointF",
-            "x": 2655.778424569198,
-            "y": 1721.9946692493584
-        },
         {
             "type": "QPointF",
             "x": 2655.953419573936,
diff --git a/src/test/ValentinaTest/share/Issue_937_case_1a/output.json b/src/test/ValentinaTest/share/Issue_937_case_1a/output.json
index b80bb28d3..4dbc8b3a5 100644
--- a/src/test/ValentinaTest/share/Issue_937_case_1a/output.json
+++ b/src/test/ValentinaTest/share/Issue_937_case_1a/output.json
@@ -262,18 +262,13 @@
         },
         {
             "type": "QPointF",
-            "x": 2570.686181649168,
-            "y": 196.7162157025718
+            "x": 2570.3339930185716,
+            "y": 196.33148010029032
         },
         {
             "type": "QPointF",
-            "x": 2580.973552524787,
-            "y": 207.2276391804366
-        },
-        {
-            "type": "QPointF",
-            "x": 2586.793533689666,
-            "y": 212.3887020561312
+            "x": 2587.447320552787,
+            "y": 212.87881200409126
         },
         {
             "type": "QPointF",
diff --git a/src/test/ValentinaTest/share/panties_case1/input.json b/src/test/ValentinaTest/share/panties_case1/input.json
new file mode 100644
index 000000000..4bbbca53f
--- /dev/null
+++ b/src/test/ValentinaTest/share/panties_case1/input.json
@@ -0,0 +1,225 @@
+{
+    "vector": [
+        {
+            "saAfter": 37.795275590551185,
+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1754.6061049829982,
+            "y": 531.4354372476321
+        },
+        {
+            "saAfter": 37.795275590551185,
+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1755.035021219421,
+            "y": 531.2296740038928
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1731.1558631613466,
+            "y": 543.8819183739275
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1708.0908414518603,
+            "y": 557.5077911434734
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1685.9636931635305,
+            "y": 572.2153875573874
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1664.8981553689239,
+            "y": 588.1128028605269
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1645.0179651406086,
+            "y": 605.3081322977491
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1635.6181662479514,
+            "y": 614.4871302890493
+        },
+        {
+            "angle": 6,
+            "saAfter": 37.795275590551185,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1612.1619789843503,
+            "y": 637.7149723258838
+        },
+        {
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+            "type": "VSAPoint",
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+            "y": 672.4383426796408
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+        {
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+            "y": 696.1033753389547
+        },
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+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
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+            "y": 720.6133615365002
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+            "type": "VSAPoint",
+            "x": 1516.4064019514353,
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+            "type": "VSAPoint",
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+            "type": "VSAPoint",
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+            "saBefore": 37.795275590551185,
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+            "x": 1484.701051674077,
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+            "type": "VSAPoint",
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+            "y": 818.5825511811023
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+        {
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+            "type": "VSAPoint",
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+            "y": 80.2803785523032
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+        },
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+            "x": 1674.2918946312718,
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+        },
+        {
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+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1674.2918946312718,
+            "y": 75.9509162231673
+        }
+    ]
+}
diff --git a/src/test/ValentinaTest/share/panties_case1/output.json b/src/test/ValentinaTest/share/panties_case1/output.json
new file mode 100644
index 000000000..7ff3a3c62
--- /dev/null
+++ b/src/test/ValentinaTest/share/panties_case1/output.json
@@ -0,0 +1,119 @@
+{
+    "vector": [
+        {
+            "type": "QPointF",
+            "x": 1786.0710599536046,
+            "y": 557.5240420963199
+        },
+        {
+            "type": "QPointF",
+            "x": 1749.6370245691528,
+            "y": 576.8618185344574
+        },
+        {
+            "type": "QPointF",
+            "x": 1728.1778640671305,
+            "y": 589.53901409164
+        },
+        {
+            "type": "QPointF",
+            "x": 1707.8277589214797,
+            "y": 603.0654355519599
+        },
+        {
+            "type": "QPointF",
+            "x": 1688.670698833411,
+            "y": 617.5225903218325
+        },
+        {
+            "type": "QPointF",
+            "x": 1670.606812298871,
+            "y": 633.1469116341913
+        },
+        {
+            "type": "QPointF",
+            "x": 1638.7562352935086,
+            "y": 664.5706679662566
+        },
+        {
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+            "x": 1604.747593949502,
+            "y": 698.6645894751346
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+        {
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+            "y": 743.8376573322635
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+            "x": 1548.001349773686,
+            "y": 767.1484842790478
+        },
+        {
+            "type": "QPointF",
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+            "y": 785.1361089771601
+        },
+        {
+            "type": "QPointF",
+            "x": 1530.96996819389,
+            "y": 797.234929401359
+        },
+        {
+            "type": "QPointF",
+            "x": 1525.37666027745,
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+        {
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+        },
+        {
+            "type": "QPointF",
+            "x": 1522.1062814637592,
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+        },
+        {
+            "type": "QPointF",
+            "x": 1367.3858268487456,
+            "y": 845.0392440944881
+        },
+        {
+            "type": "QPointF",
+            "x": 1367.3858245359263,
+            "y": 51.31926950196146
+        },
+        {
+            "type": "QPointF",
+            "x": 1468.027554616979,
+            "y": 53.613267032547995
+        },
+        {
+            "type": "QPointF",
+            "x": 1539.013269415257,
+            "y": 53.82289230805872
+        },
+        {
+            "type": "QPointF",
+            "x": 1619.7509698318393,
+            "y": 52.1830892504392
+        },
+        {
+            "type": "QPointF",
+            "x": 1696.2923013503678,
+            "y": 48.363400642197
+        },
+        {
+            "type": "QPointF",
+            "x": 1786.0710599536046,
+            "y": 557.5240420963199
+        }
+    ]
+}
diff --git a/src/test/ValentinaTest/share/panties_case2/input.json b/src/test/ValentinaTest/share/panties_case2/input.json
new file mode 100644
index 000000000..5151c9f70
--- /dev/null
+++ b/src/test/ValentinaTest/share/panties_case2/input.json
@@ -0,0 +1,225 @@
+{
+    "vector": [
+        {
+            "angle": 5,
+            "saBefore": 37.795275590551185,
+            "type": "VSAPoint",
+            "x": 1482.2456692913386,
+            "y": 818.5825511811023
+        },
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+            "saAfter": 0,
+            "type": "VSAPoint",
+            "x": 1367.9527559055118,
+            "y": 818.5825511811023
+        },
+        {
+            "saAfter": 26.45669291338583,
+            "saBefore": 0,
+            "type": "VSAPoint",
+            "x": 1367.9527537469328,
+            "y": 77.79514960629922
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+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1379.291336424098,
+            "y": 77.795149526357
+        },
+        {
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+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1379.291336424098,
+            "y": 77.795149526357
+        },
+        {
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+            "saAfter": 26.45669291338583,
+            "saBefore": 26.45669291338583,
+            "type": "VSAPoint",
+            "x": 1390.7358254826636,
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+        {
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+        {
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+        },
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+            "x": 1674.2918946312718,
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diff --git a/src/test/ValentinaTest/share/panties_case2/output.json b/src/test/ValentinaTest/share/panties_case2/output.json
new file mode 100644
index 000000000..4d08316a8
--- /dev/null
+++ b/src/test/ValentinaTest/share/panties_case2/output.json
@@ -0,0 +1,119 @@
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diff --git a/src/test/ValentinaTest/share/seamtest1_by_angle/output.json b/src/test/ValentinaTest/share/seamtest1_by_angle/output.json
index cc7d2f408..a52ae008e 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_angle/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_angle/output.json
@@ -220,11 +220,6 @@
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diff --git a/src/test/ValentinaTest/share/seamtest1_by_angle_2/output.json b/src/test/ValentinaTest/share/seamtest1_by_angle_2/output.json
index 2692f47df..869ca88a2 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_angle_2/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_angle_2/output.json
@@ -135,11 +135,6 @@
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index bab7a2661..b93e8ff38 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_first_edge_symmetry/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_first_edge_symmetry/output.json
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index a59c56474..1ff3aaa38 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_first_right_angle/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_first_right_angle/output.json
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diff --git a/src/test/ValentinaTest/share/seamtest1_by_intersection/output.json b/src/test/ValentinaTest/share/seamtest1_by_intersection/output.json
index d4323059c..70cde564a 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_intersection/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_intersection/output.json
@@ -225,11 +225,6 @@
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diff --git a/src/test/ValentinaTest/share/seamtest1_by_second_edge_symmetry/output.json b/src/test/ValentinaTest/share/seamtest1_by_second_edge_symmetry/output.json
index 3803b3f9d..6ac8f2b7a 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_second_edge_symmetry/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_second_edge_symmetry/output.json
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diff --git a/src/test/ValentinaTest/share/seamtest1_by_second_right_angle/output.json b/src/test/ValentinaTest/share/seamtest1_by_second_right_angle/output.json
index 6a4d6dc9a..fc277af66 100644
--- a/src/test/ValentinaTest/share/seamtest1_by_second_right_angle/output.json
+++ b/src/test/ValentinaTest/share/seamtest1_by_second_right_angle/output.json
@@ -225,11 +225,6 @@
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diff --git a/src/test/ValentinaTest/share/smart_pattern_#36/input.json b/src/test/ValentinaTest/share/smart_pattern_#36/input.json
index 84a1732e2..6e2bee37f 100644
--- a/src/test/ValentinaTest/share/smart_pattern_#36/input.json
+++ b/src/test/ValentinaTest/share/smart_pattern_#36/input.json
@@ -10,6 +10,12 @@
             "x": -188.23334010667102,
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@@ -246,6 +252,21 @@
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diff --git a/src/test/ValentinaTest/share/smart_pattern_#36/output.json b/src/test/ValentinaTest/share/smart_pattern_#36/output.json
index 9bfd97b5c..c37c36ed6 100644
--- a/src/test/ValentinaTest/share/smart_pattern_#36/output.json
+++ b/src/test/ValentinaTest/share/smart_pattern_#36/output.json
@@ -2,8 +2,23 @@
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diff --git a/src/test/ValentinaTest/share/smart_pattern_#58/input.json b/src/test/ValentinaTest/share/smart_pattern_#58/input.json
index d203778fe..7fbff83ca 100644
--- a/src/test/ValentinaTest/share/smart_pattern_#58/input.json
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diff --git a/src/test/ValentinaTest/share/smart_pattern_#58/output.json b/src/test/ValentinaTest/share/smart_pattern_#58/output.json
index e645993f5..7094dc587 100644
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 }
diff --git a/src/test/ValentinaTest/share/test_data.qrc b/src/test/ValentinaTest/share/test_data.qrc
index cbf9210ea..83d363a08 100644
--- a/src/test/ValentinaTest/share/test_data.qrc
+++ b/src/test/ValentinaTest/share/test_data.qrc
@@ -123,5 +123,9 @@
         <file>160-42_intersection/points.json</file>
         <file>busty/input.json</file>
         <file>busty/output.json</file>
+        <file>panties_case1/input.json</file>
+        <file>panties_case1/output.json</file>
+        <file>panties_case2/input.json</file>
+        <file>panties_case2/output.json</file>
     </qresource>
 </RCC>
diff --git a/src/test/ValentinaTest/tst_vabstractpiece.cpp b/src/test/ValentinaTest/tst_vabstractpiece.cpp
index 48ea40f01..4a2c4b1c3 100644
--- a/src/test/ValentinaTest/tst_vabstractpiece.cpp
+++ b/src/test/ValentinaTest/tst_vabstractpiece.cpp
@@ -1081,6 +1081,18 @@ void TST_VAbstractPiece::EquidistantAngleType_data()
                      QStringLiteral("://busty/input.json"),
                      QStringLiteral("://busty/output.json"),
                      0 /*seam allowance width*/);
+
+    // See file src/app/share/collection/bugs/panties.val (private collection)
+    ASSERT_TEST_CASE("Panties. Piece Case 1",
+                     QStringLiteral("://panties_case1/input.json"),
+                     QStringLiteral("://panties_case1/output.json"),
+                     26.45669291338583 /*seam allowance width*/);
+
+    // See file src/app/share/collection/bugs/panties.val (private collection)
+    ASSERT_TEST_CASE("Panties. Piece Case 2",
+                     QStringLiteral("://panties_case2/input.json"),
+                     QStringLiteral("://panties_case2/output.json"),
+                     26.45669291338583 /*seam allowance width*/);
 }
 
 //---------------------------------------------------------------------------------------------------------------------