I have this actual problem.. with size 0 dresses. Sometimes XS dresses and skirts are like this too. It's very annoying honestly, because they're tight around the chest, too short on the ass, but baggy on the waist?? How does that make any sense, at all.  Oh and don't even get me started about XS tops. Sure, they fit around the tits but in the waist? Nope, still baggy. Or too short. Sizing is a goddamn nightmare now if you're not A) fat or B) a box