Give your guest room the feel of a den with the help of a quick-change cover that makes your daybed look more like a couch, while not losing the function of an extra bed. Unlike a comforter on a traditional bed, a daybed cover only needs to cover three sides of the bed, the front and right and left sides. Since the mattress on a daybed is the same size as a twin mattress, you can turn a twin-size comforter into a daybed cover with a few simple cuts and stitches.
Drape the comforter over the daybed, wrong side up. Adjust the comforter to it falls about 4 inches down the back side of the daybed. The comforter should fall evenly on the two sides of the bed and the bulk of it should fall down the front of the bed. You'll trim excess later if needed.
Draw two vertical lines on the comforter at the front corners of the daybed, so you can clearly see where the comforter hits the corners.
Cut along the two lines you drew to create two slits in the comforter. Each slit will have two raw edges. The two slits will make help the cover fit over the daybed without bunching.
Measure from the front edge of the daybed mattress to where you want the cover to hit and mark the length on the comforter, all the way across. If you're using a bed skirt or ruffle, you'll want the cover to stop just above where the ruffle begins. If you are not using a ruffle, you'll want the cover to extend almost to the floor.
Take the comforter off of the bed and trim it along the marked line.
Cut four pieces of bias binding that each measure the length of the corner slits, plus 1 inch. Unfold one piece of bias binding and position the inside center of the fold against the raw edge of one raw edge of the left hand slit on the corner. The binding should extend beyond the top of the slit by 1 inch and line up evenly with the bottom of the slit. Tuck the excess binding under to give it a smooth edge, then pin the binding to the edge. Repeat with the remaining raw edge on the left side and the two on the right side corner.
Sew the binding to the four edges on the corner slits.
Cut another length of binding long enough to cover the raw edge along the bottom of the comforter.
Unfold the binding and pin it to the bottom edge of the comforter, positioning the inside center fold of the binding against the raw edge of the comforter. Tuck the ends of the binding under to conceal any raw ends.
Sew the binding to the comforter's edges. Drape the finished comforter over the daybed, right side up.