Nice hoodie but comes up very small

This hoodie is very cosy, has a lovely soft lining and looks great HOWEVER it comes up SO small! I'm a UK size 8 and always order an M when buying Rammstein merch and it fits fine. However when I received this one it was really tight on the arms and quite snug around my body - I nearly turned myself into a pretzel trying to get it off and I almost had to get someone to help me!

I exchanged it for a large and whilst I still need to turn it inside out to take it off (instead of taking my arms out of the sleeves first) it fits better. Honestly, unless you're a child I wouldn't bother with the small or medium at all. I think the men's version might be an overall better fit.