One side of the seam allowance is folded over, encasing the raw edge of the other seam allowance.
Lightweight fabrics that are not prone to raveling. Items that will have visible seams.
Produces a neat, clean seam finish that won’t ravel.
Adds some bulk to the seam allowance, making it unsuitable for medium to heavy weight fabrics. Somewhat time consuming.
How to Make
After pressing the seam open, trim one side of the seam allowance to 1/8”. Turn the edge of the other seam allowance under 1/8” and press. Turn this pressed seam allowance under again, covering the raw edge of the other seam allowance. Place the folded edge so that it just covers the stitching. Stitch close to the folded edge. Press the seam allowance to one side.