<p>Pay attention to the dimensions of the duvet you buy and get sheets that have at least those dimensions with several inches extra for seaming each side. My D likes extra blanket width so I may have bought a full/queen duvet and full sheets. I sewed three sides and a small amount on each end of the bottom side, then left an opening large enough to get the duvet in and out. I turned the fabric under and sewed Velcro to each side of the opening. Some people do buttonholes and buttons, some sew on snaps and some add ribbon for a few ties. You can do it simple or intricate. </p>