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---
title: "Flat-felled seam allowace"
---
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Controls the amount of seam allowance on flat-felled seams.
The armhole and side seams on the shirt are flat-felled seams, and those require extra seam allowance.
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How much is a matter of personal preference, since some people prefer wider flat-felled seams,
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while others have a preference for more narrow flat-felled seams.
This option controls the amount of flat-felled seam allowance as a factor of the regular seam allowance.
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## Effect of this option on the pattern
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