How do you keep your "what's it called" (totally just drew a blank ).... feather blanket thingy in your duvet without it moving around? It is such a pain in the arse!
We have an old down comforter aka the "insert," (DH has had it since 1999 and it wasn't new then) that moves around because the duvet cover is too big for it. Our other down comforter is fine, but its probably about 10 years old and in a PB duvet. With the one that is too big, I line up the top of the comforter with the duvet and shake it when I make the bed so it lays flat, but it doesn't last long.
I don't have much of an issue with mine moving around... but all the 'stuffing' is now down at the bottom of the duvet! I have no idea how to fix that, or why it's doing that. Maybe we just bought a cheap one??