Custom duvet cover fits- inside very slippery- faux suede?

Question

Can you think of any ideas to make the inside of the duvet cover not slip? The comforter is just the right size, so that's a help! The thing is, I made this cover from faux suede with a very satiny lining.

Some ideas so far are nbuttons inside, though that could feel weird when sleeping,

and a partial rubber lining, like those rubbermaid non-slip mats, but that's weird also.

Any improvements on this or any tried-and-true ideas?

Answer 1

Sew a piece (about 12" long) of ribbon or a fabric strip to the inside of the duvet cover in each corner . (Fold the ribbon or fabric strip in half and sew on the fold so you have two ends) and being careful a small loop on the duvet and tie the corners in place. It works, I did it.

Inge