Well, I know I've changed in 5 years. I used to sleep with sweat pants, T-shirt, sweatshirt, and multiple blankets. Can't handle that now. I prefer minimal clothing b/c the sheets feel good; I don't seem to get half as cold as I used to sleeping - I think I actually heat up!
A baffle-box construction is an excellent feature to look for in a down comforter. The box style keeps the feathers from shifting completely to the bottom; they are trapped within their box.
That's what mine is, and I haven't had any problems with shifting.