After a skirt has been basted and stitched, it is well to allow it to hang for a number of days in order to sag as much as it will. It may then be hemmed, and it will stay even for some time. If seams are stayed with a very firm piece of material, such as tape or selvage, they may creep up, or the bias material at each side of the seam may sag down. Better than to use a straight edge, is to use a binding on a different bias from that of the seam. This will keep the seam from sagging, but it will be sufficiently elastic to make a graceful seam.