As you could probably guess from the pictures, the armor plates were made from a stop and a dead end sign (obtained through legal means, of course). These are affixed via arming points to a harness made from belts that features ammo loops and two straps to hold equipment. The plates were formed, in the spirit of the end of the world theme, the old fashioned way; with a ball peen hammer and an anvil.
Special thanks to Eric L. for modeling the armor!
More images of the armor can be found here: http://www.facebook.com/media/set/?set=a.254780294533679.73230.176049985740044&type=1