Lets see my buddy I work with in the Government use to be a PMC for 5 months, and the gear he carried was like normal 5.11 Tactical stuff.
http://www.chiefsupply.com/home.asp
Thats a very good site for clothing and gear that suits a PMC, you can basicaly put things together by looking threw the site, I know my Department buys a few things here like gloves and handcuffs because of the deal.