My new project is to make teh same undersuit like in HALO 3. I'll use kelvar with some pandding for the soulder, back, breast, leg, arm. I don't know how much time that will take for me to do and how much that will cost but, i'm ready to make one!
The kelvar I have used at work is like heavy yellow fiberglass cloth. It would be stiff for a clothing fabric application. I don't think it takes dye either. You need special shears to cut it or a hot knife. Also it abrades easily sheading loose hair-like fibers.
We currently use it as a handle reinforcements sandwiched between layers of nomex in the walls of cargo bags for space flight.