We have already heard there will be two versions of Cap's costume in the upcoming Captain America: The First Avenger. A flashy one for the USO appearances will be the first appearance. JoBlo.com got a peek at the second combat ready one that will be the prominent one for the film.
Here is the description as told by Mike Sampson at Joblo:
The first thing I noticed is that the trademark wings that flank the side of Cap's hood are gone. In fact the "hood" is gone entirely. In its place is a more traditional M1 Army helmet though this helmet does come over the eyes to give Cap a traditional "domino mask" look. Still present is the white "A" in the middle of the hat (nothing fancy, this is the traditional font), though like the rest of the costume, the blue of the helmet is much more muted than the blue in the comic costume. A thick black strap comes down over the ears and connects under the chin.
His shoulders have pads over them that extend down to about mid-bicep and are attached via a brown strap under the arm. The sleeves (for lack of a better word) are white with a fairly standard brown glove.
The fabric of the costume doesn't look like the scaled material of SPIDER-MAN but more of a leather fabric, like something you'd see on one of the X-MEN. Cap wears an old school utility belt, the likes of which we haven't seen much in modern superhero movies.
For the full description, click the link below.