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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. How much is a matter of personal preference, since some people prefer wider flat-felled seams, 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.

## Effekt dieser Option auf das Schnittmuster

![Dieses Bild zeigt den Effekt dieser Option, indem es mehrere Varianten überlagert, die einen anderen Wert für diese Option haben](simon_ffsa_sample.svg "Effect of this option on the pattern")