Ok so this year I finally completed my Snake Solid costume for FANIME 2011 and this what I used (I probably spent about $640-$675 on this):
Propper BDU's customized, I removed the bottom to pockets from the coat and had them sewed on to the sleeves. The camoflauge pattern I used was Subdued urban which has been discontinued since 2009.
BDUs from bdu.com ($45) but the ones I used are no longer avaliable
black G.I. LC-2 pistol belt ($20 local surplus shop)
BDS tactical M16 drop rig pouch ($75 holds up to 6 30rd .223 mags) bdstacicalgear.com
Eagle industries SAS MP5 drop rig ($65 holds 3 SMG mags) eagleindustries.com
Bison last chance belt (BDU belt $12 from local camping shop)
Yates USN assault harness ($150 yatesgear.com)
Alta tactical elbow & knee pads (about $20 knee pads $10 elbow pads from botachtacical)
Altama padded jungle boots ($50 clearance from vtarmynavy.com)
Rocky tactical rappel gloves ($10 from local cop shop on clearance rack)
Guarder SWAT vest ($150 from Taiwan intrudershop.com.tw)
and I used various pouches on the belt a mix of Bianchi(dual pistol mag case) and G.I. ALICE (single pistol mag pouch, compass/bandage pouch)
I cut up a old black t-shirt for Snake's headband/bandana.