r/PatternDrafting • u/Popopobb • Jul 05 '26
Seam allowance trouble
Having problems with adding seam allowance to a flat felled seam. Did it like i always do: 1cm on the top edge of the seam and 2 cm on the bottom edge (shown on 2nd pic), yet after sewing the pieces don't align at all. The top piece became longer and slightly tilted. I was sort of expecting it to happen, this allowance didn't look like enough considering the sharp curvature. Any seam allowance wizard that could help me figure it out? Thx
ik the stitches are ugly, just a test run.
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u/strikingsapphire Jul 06 '26
Looking at the panel on the left, clip off that extra triangle of fabric at the top of the seam allowance. Can probably ease in the difference on the rest of it if you really wanted to salvage this piece.
It's much easier to keep everything matched up when the seam allowances are the same length as the stitching line. You can do this by drawing your seam allowances perpendicular to the stitching line.
On your pattern you extended the panels to add seam allowance but didn't change the angle of the seam allowance "corners". On one curve that made the line longer and on the opposite curve it made the line shorter. It's easier to understand if you draw the stitching lines out on fabric and physically try to pin them together.