Thanks guys!
Snake's wearing a heavily re-tailored Soldier Story (I think?) MACV-SOG BDU, belt and pouches. The harness metalwork came from a parachute harness off eBay, I don't know the brand. His hands are from that knock-off "Metal Boss" figure and he's got Newline boots. The wetsuit is scratch built.
The Boss's belt and pouches are from the same set as Snake's and her BDU and wetsuit are sewn from scratch.