The gathering stitch, like the basting stitch, is an extra long, straight stitch.

A gathering stitch is similar to a basting stitch, it can be described as an extra long straight stitch it is most commonly used for adding fullness to a project such as sleeves or curtains. Gathering can be subtle (easing in a sleeve) or full (creating a poufy sleeve). The permanent stitching placed directly on top of the gathering stitch, placed away from the fabric edge. The final effect is a seam which appears ‘gathered.’