Felled seam, or flat-fell seam, is a seam made by placing one edge inside a folded edge of fabric, then stitching the fold down. The fold encases the raw edges protects them from fraying. The fold may be secured with a topstitch or a whipstitch. It is useful for keeping seam allowances flat and covering raw edges.
There are flat-felled seams and lap-felled seams. A flat-felled seam can be used on various fabrics not just denim, they can even be used on delicate fabrics such as voile.
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