Cool costume - I like. You do realize, though, that kevlar weave, in the real world, is REALLY dense, heavy stuff? Your cape alone would weigh about forty pounds.
I would suggest, instead - well, I actually can't remember what it's called, but it's some sort of new sports fabric that hardens dramatically upon impact with something. So, if, for example, a crook tried to punch you in the stomach, he'd probably break his fist, while you'd just get a slight bruise. Much more practical than Kevlar.