So I've found one of my old my own body armor carriers and put into service as a
Tetsuya Mizuguchi-style controller corset (although I prefer to call it a vest). Worked out pretty well since there's a pocket on the chest for a ceramic plate, that happened to be perfectly Xbox 360 controller sized:
I tested it out on Area 2 of Rez HD, along with two more controllers (one in each side pocket of a pair of cargo pants). It was really cool, the two on my legs were vibrating in sync with one other, and separate from the one on my chest and the one in my hands.
Now I just have to figure out what I'm going to do with the 4th controller (it'll be free since I'll be using Kinect, at least initially).