Possibly more of a WWYD...
MIL gave me a dress for my bday recently, it's nice but the colour doesn't really suit me. It also doesn't fit perfectly as it's a bit too big. I thought perhaps it would look better in a smaller size.
I googled it to see if a smaller size was in stock and it turns out it's £££! About 10 times more expensive than the last (admittedly cheap) dress I bought.
WIBU to swap it for a different item that suits me more? I feel that given it cost so much I should get a really good amount of wear out of it, rather than just wear it a few times to work when I've nothing else in the wardrobe...
I think MIL would be a bit offended if I took it back tbh, and I'd already said thank you and I liked it when she gave it to me. I think she must have been pretty convinced it was THE dress for me to have spent a lot on it.