My mum used to do this to me. Now I've gotten used to it and I buy everything in giant sizes because I like them that way, and she gets annoyed because she wants me to wear normal stuff.
I wouldn't buy it that big... but yeah, I do this. My daughter loves the long sleeves (helps with anxiety to have something to hold on to) and my son just likes waving his hands around like a wacky waving arm flailing inflatable tube man!
Mom hurls flying shoe :/