Separate piece permanently attached to an item of clothing at the neckline. May be made of matching or contrasting fabric, or be decorative, e.g., trimmed with lace or embroidery. Shape may be flat, rolled, standing, or draped. Differentiated from neckline as it is an extra piece stitched on, or turned over, at neckline
Definition source:
Mankey 88
Context:
Most necklines and collars require a back neck facing
