The whole thing consists of:
-Green khaki pants.
-Aviator jacket or trench coat.
-WWII helmet painted blue with decals.
-Realistic BB pistol.
I made the shield from scrap sheet metal, find the instructable for that here
The whole thing cost me under $50 to make, but if you were to buy and make everything from scratch i estimate it at $150 if you buy everything including clothing.
Hope youre inspired to try your own rendition of this awesome Avenger!