Facing type. Creating Patterns

A facing is a duplicate layer of fabric stitched to the raw edge of a garment for the purpose of clean finishing the seam. It is normally sewn, to the garment fabric, with the correct sides together, and turned to the inside of the garment and lays flat. However, it may be folded to the outside for decorative purposes.
Usually a facing follows the shape of the piece to which it is being attached, except if bias strips are used in place of the traditional facing.
There are several types of facings, each requiring slightly different methods of construction. In some cases the type of facing needed is indicated by a separate pattern piece and in others the facing pattern piece is included with the garment section and cut along with the garment section. Some of the types of facings are

Bias facing - A narrow bias strip of fabric, commercially or self-prepared, stitched to the garment and turned to the inside. It is...