Topstitching is a sewing technique. It is used most often on garment edges such as necklines and hems, where it helps facings to stay in place and gives a crisp edge. It can also be used to attach details like pockets or tabs on zippers, especially on bags. Decorative topstitching is designed to show, and may be done in a fancy thread or with a special type of stitch. Otherwise, topstitching is generally done using a straight stitch with a thread that matches the fashion fabric.