Facing (sewing)
In sewing and tailoring, facing is fabric applied to a garment edge, on the inside. Shaped facings are cut to match the outside shape of the piece to provide a neat finish, and are often cut from the same pattern pieces. Shaped facings are typically made of the same fabric as the garment, but may also be made of lighter-weight fabric or in a contrasting color as a design element. Extended facings are extensions of the garment fabric, folded back and usually stabilized. Bias facings are strips of lightweight fabric cut on the true bias (US) or cross-grain (UK), and shaped rather than cut to match the edge to which they are applied.
Notes
References
Picken, Mary Brooks (1957). The Fashion Dictionary. Funk and Wagnalls.
Shaeffer, Claire B. (2007). Couture Sewing Techniques. Taunton. ISBN 978-1-56158-497-0.