In my Avengers movie I'd design the costumes, for the most part, exactly like this:
Captain America
* Combination 616 and Ultimate. Mostly Ultimates though.
* Thin layer of “vibranium chainmail” around the torso. (Only shown when “dressing/undressing”
* Over that “advanced ceramic and titanium composite-disc-scale body armor” (modeled after dragon skin---see below) covering the torso. A thin NAVY BLUE stretchy fabric sewn over it (Lycra or Elastane). And a WHITE star on the chest. No stars on the shoulders.
* The same fabric covers the face; the famous Cap balaclava mask, with an WHITE “A” on the forehead (the rest of the team makes fun of it throughout the movie). No wings; instead: thick seams, like the ultimate cap.
* NAVY BLUE Pants: I like the cargo pants design. A lot of people don’t agree. Otherwise, a thicker combination of pleather-like material (I forget the name) and thermal neoprene.
* BRICK RED calf-high combat boots.
* Gloves are BRICK RED, same color as boots. Do not flare out as much; modeled after light-sparring fencing gloves.\
* BLACK utility belt with brown leather pouches modeled after US Amry S.I. MOLLE.
* Shield is classic round shield, red-white-red; blue and white star in the middle.
The blue torso armor is the toughest part, in its texture. Similar to Spider-man's costume webbing. I would base it off of something called Dragon Skin.
http://www.youtube.com/watch?v=KS0pSwdQfbY
Instead of all the exterior padding and fabric used to cover the ballistic vest shown in the video, I would use the thin elastic fabric stated above, that would give the scale-mail texture. Maybe even muscle padding underneath to give it more shape.