Captain America
I like the costume design, although I think the helmet could still use a bit of a tweak. It looks functional, but still has all the key Captain America elements and it fits well with the WW2 setting without looking too retro. Word is he starts off with one costume, which is more for show, and changes over to this one when he finally gets into combat, so that makes sense. This costume also only needs to hold through this one movie, since he'll presumably get a costume update when he is unfrozen for Avengers.