Facing (sewing)
In sewing
Sewing is the craft of fastening or attaching objects using stitches made with a needle and thread. Sewing is one of the oldest of the textile arts, arising in the Paleolithic era...

 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
Pattern (sewing)
In sewing and fashion design, a pattern is an original garment from which other garments of a similar style are copied, or the paper or cardboard templates from which the parts of a garment are traced onto fabric before cutting out and assembling .Patternmaking, pattern making or pattern cutting is...

 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
Contrast fabric
Contrast fabric is a term used in sewing used to refer to a fabric piece or embellishment made from a different fabric than the main fabric. The term contrast fabric directly contrasts with the term self-fabric....

 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
Bias (textile)
The bias or cross-grain direction of a piece of woven fabric, usually referred to simply as "the bias" or "the cross-grain", is at 45 degrees to its warp and weft threads. Every piece of woven fabric has two biases, perpendicular to each other...

(US) or cross-grain (UK), and shaped rather than cut to match the edge to which they are applied.
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