How To Make A Gathered Bed Skirt. Your raw edges should now be. To determine the length of the bed skirt, measure the distance from the top of the box springs to the floor and add 21/2 for the seam allowance and hem.
I measured to 20 inches and snipped in about an inch and a half. You can tape the loop side on the boxspring edges. Soullife sewing machine for beginners ~ $80: