Not even a Brie Larson hater (I actually try to fool myself that her legs looked good when she played Envy Adams), but I agree with OP and the rest that she looks bad in that costume, mainly due to her lack of ass. It's okay to be underpriviledged in the rear department, but they should have at least worked with it, in that case, and made a costume that hid that problem. The costume and the actress don't go together, at all. Also, she's playing a superhero, a very well endowed one at that. If Chris Evans looked like Andrew Garfield when he did the first Cap film, everyone and their mother (specially their mother) would have bitched about it. Now we can't bitch about the fact that they cast a girl with less ass than most of the male cast she'll be acting with, even though the character she's playing has always been portrayed as a voluptuous woman? Please, give me a break.