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A dashed line inside the cutting line.
Also known as: Stitching line, Seam line marking
The seam allowance is the margin between the cutting line and the stitching line. Its width is not universal: home patterns commonly use fifteen millimetres, industrial patterns often ten, and many Japanese and European patterns include none at all and require the sewer to add it.
Marks the margin between the cutting edge and the stitching line on a pattern piece.
Contexts: Laundry
Varies by publisher and country, with some pattern traditions omitting it entirely and expecting the sewer to add their own.
Contexts: Laundry
A line of long dashes drawn parallel to and inside the solid cutting line of a pattern piece.