Martha Stewart Living, July 2011
Cut 9-inch lengths of grosgrain ribbon or twill tape. Notch 1 end, or cut it at an angle. Loop the other end through 2 D rings, wrapping ribbon around the rings' straight edges, and glue it to itself with fabric glue.
Center a rolled napkin on the ribbon; thread the ribbon's free end through the rings as you would a belt, and pull it snug.