Pad stitches secure two or more layers of fabric together and give the layers more firmness; smaller/denser stitches create more firmness. Pad stitches may also enforce an overall curvature of the layers. Tailors pad stitch a jacket's lapel and undercollar to give them more firmness and to help them maintain their curvature. The line of stitching usually runs parallel the direction of the most important curve of the layers. For example, pad stitches in a suit's lapel run parallel to the lapel's roll line; pad stitches in the undercollar of a tailored jacket run parallel to the collar back edge.