The two stitching techniques that are commonly used to prevent stretching of the edges of seamlines are staystitching and understitching. Staystitching is a line of stitching that is sewn within the seam allowance to stabilize the fabric and prevent it from stretching or distorting. Understitching is a line of stitching that is sewn on the facing side of a garment or other sewn item to help the facing lay flat and prevent it from rolling to the outside of the garment.