Originally Posted by nativetexan
I've not made one but it seems you would use a backing for your quilt top (no batting) and "quilt" it, then add another backing (sheet) and sew on for the duvet.
good luck.
I made it this way for the son with the down comforter. It washed well this way. I put velcro at the bottom where you insert it...next time I may do buttons and buttonholes...