Add 1 inch (25 mm) to the width and length measurements and 2 inches (5 cm) to the height measurement for the seam allowance. You now have the measurements that you will use for your panels.

If you’re making your bed skirt out of thick fabric like canvas, use a heavy needle with a ballpoint. This will help you sew through the fabric easily. [2] X Expert Source Alessio IadiciccoApparel Manufacturing Specialist Expert Interview. 16 June 2021.

Set your sewing machine to a zig-zag stitch, on the longest available stitch length. You will be stitching 1/2 inch (12 mm) in from the top edge (opposite of the hemmed edge) of the skirt paneling. Line up cotton crochet thread in the center of the presser foot so that, when you sew, the zig-zag stitch encloses the crochet thread. Make sure you do not sew the crochet thread into place, as you will need to pull it through the chamber made by the zig-zag stitching in order to create the gathering. Sew along the entire length of the panel. Pull the crochet thread from either end of the panel in order to gather the fabric until the panel is the appropriate width or length measurement. Adjust the gathers until they appear to be evenly spaced. Sew a straight stitch along the gathered edge to secure the gathers in place.

Using a fitted bed sheet will not cover any space under the box spring, meaning that under-the-bed storage will be exposed.