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--- title: "Flat-felled seam allowace" --- 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.