So there we have it! I think it's a terrific idea, and plan on using it on my beds now!
I use a fluffy white feather comforter on my own bed, and hate having a duvet over it. The duvet just gets tangled up and shifted around so badly, and I just don't like it. I figure I can wash my comforter when it needs it instead... I also dislike using pillowcases, cause they invariably put creases in my poor old cheeks and they stay there for most of the day. Soo.. my solution is using nice white cotton pillow covers that have zippers.
Works for me!