Originally Posted by Jennifer23

Madamekelly - I find that duvets stay nicely in their covers unless the cover is much too big for the duvet. I have one cover that's too big; with it, I hold the bottom corners (of cover + duvet) and shake it towards the top once a week when I change the sheets. Otherwise, they just stay... by friction, I guess?

Give it a try; since you already have the comforter and duvet cover, the worst outcome is that you don't like it and go back to your old system.