The Welt Seam
This is a great variation on the plain seam. It’s used to add an extra ounce of strength to seams that might need it. It’s achieved by sewing a plain seam and pressing the seam allowance in one direction, then a second topstitch is sewn from the fabric’s topside to secure the seam allowance. This seam works well as a decorative accent and can provide just the right touch to a yoke or style line.