Captain America's Costume/Shield Evolves Over The Course Of The Movie
Chris Evans revealed at Comic-Con that his costume in Captain America: The First Avenger evolves over the course of the film, and that we don't really see his final suit until the end of the movie.
Evans said the following to MTV:
"It's a World War II movie, so I think a little bit of a cumbersome feel to it and something that's a bit chunkier ... not only serves the time period, I think it looks better. It's not this sleek spandex suit. It looks like something you might wear in the '40s in the middle of a war." ... "There's a couple stages and initially in the script, Steve isn't Captain America right away. He gets the injection and isn't asked to go to war right off the bat. He's used in different areas and different facets, so he has different stages of the suit. I don't think he actually jumps into the final suit until the third act of the film."
Evans says that Captain's shield will also evolve over the course of the film:
"Well, during the USO tour, there's obviously a different shield. And he goes on a couple missions, he goes AWOL and kind of takes the USO shield. And eventually, once he's kind of allowed to be this soldier, and they outfit him with the new uniform, they decide to outfit him with an updated shield."
Many fans seem to be worried about the suit, coming out of the leaked marketing artwork and Comic-Con teaser trailer (not available online). But comic book fans often over-think/overreact abut the wardrobe of a comic book adaptations. I remember when the first images of the X-Men were released online and the fanboys went rabid. At the end of the day, most fans loved what Bryan Singer did with the X-Men movies.
You can watch the whole interview embedded below: