DIY Bed Drapery Panels. Measure WxL on bed. Choose a curtain rod that is about 2-3" larger than the bed measurements. Measure the height from rod to floor. Fabric should be several inch longer to allow for hem and circle rings/curtain strips/sewn rod insert. Hang canopy. If you choose, you can make it slightly longer than the boxspring to sew on beaded/other decor fringe.