His new design of costumes supports his ears showing.
I have two ideas that I think they might do for the next movie. This is supporting what I think Marvel is trying to do with his costume.
My first thought, which is most likely. They will take his Avengers 2 costume, but give him the color scheme of his Avengers movie look.
Or another possibility. They take his Ultimate costume.
I think that Hawkeye will support his Ultimate costume. That possibility is more likely than Cap using his I think.
Iron Man and Thor might as well get in on this Ultimate action.
I think Chris Hemmsworth can pull it off. Idk if they'd have him switch weapons out of nowhere though.
I think his Ultimate look is pretty stupid honestly. I do, however think the creative peeps at Marvel Studios can make it look bad ass.