I don't think I'll be returning any of mine. I received a couple of clothing items that I haven't tried on yet. However, I probably won't return them even if they don't fit. I *hate* returning things.
However, I will have to make a few returns for gifts bought for others.
1) Ordered a video game for my husband from Amazon and they sent a UK version apparently which will not play on US systems. (The listing does not say ANYTHING about a UK version, but the UK version is what's shown in the photo, so I guess that's my mistake)
2) Ordered a clothing item for my daughter and her "usual size" is way too big. I'm not sure if this item is mismatched (I ordered other items from the same company and the other ones fit), or if it's the way this clothing item is designed.
3) Ordered pants for my niece -- got the exact size/item SIL told me, and even called her when I got them and said "are you sure? These look huge." And she said "yes. I'm sure. She likes them big." Guess what? Too big. Sigh.