It's a flannel duvet cover that was on sale for $70 that apparently I couldn't live without. And honestly, after having slept in it the past few days, it's one of my favourite things in this house now. It's more comfortable than anything I've ever slept in, it's weird - I feel like it's almost a hotel bed.
I'm not a fan of how duvets feel (and I don't own one), so instead I bought this flannel duvet cover so that I could put my regular old comforter inside. That way I have a beautiful, warm new cover, but with the comfort of my old, I'm-sick-of-its-pattern comforter inside hiding. I swear to God it works just as well as with any duvet. I hate even writing "duvet" - such a stupid word. Almost like it knows it's expensive.
Anyhow, if you don't have a duvet or don't like them, then please try out this idea. Duvet covers can be costly, but if you look hard enough you can find a great one (or even better, a flannel one) for between $60 - $80.