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.
The flat-felled seam is the type of seam used in making denim jeans, although it appears inside-out to reduce stitching. It is also used in traditional tipi construction.
There are flat-felled seams and lap-felled seams. A flat felled seam can be used on a lot of different fabrics not just denim, they can even be used on fabrics such as voile which is a flimsy fabric.
- Moyes, Patricia (1999). Sewing Basics: Creating a Stylish Wardrobe With Step-By-Step Techniques. Taunton Press. p. 94. ISBN 9781561582662.
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- Holley, Linda A. (2007). Tipis, Tepees, Teepees: History and Design of the Cloth Tipi. Gibbs Smith. p. 87. ISBN 9781586855116.