Bought these to wear as a base layer for snowboarding(1 day out of a 5 day trip to Vegas) and ended up wearing the set multiple times separately during the trip. The bottoms totally work as leggings with a long top when it's 7am and you don't understand why you are awake because you are supposed to be on vacation and you really didn't sign up for this. I wouldn't wear the top on its own myself just because it's too tight on me, but depending on the fit it could work as well.

Anyway, I'm a size 12 with a 34DDD bust and a belly on me, I purchased a large and the set fits snuggly. Since large is the biggest size, I'm gonna say a size 12 or a brave, determined 14 is the biggest that could probably fit into this. Attached is my chubby body so you can see what I mean.

Overall, I highly recommend this set. It is super warm and reasonably priced. I've snowboarded one time in my life and wasn't prepared to drop twice as much or more on a name brand, so it was perfect for me. I got the men's version for my husband and he also approved of it, though he didn't go for the leggings look(which I think he could have rocked). To each his own.