Finally found a white pair of sweats online to use for my May Lee cosplay... ended up being a lot more trouble than I thought, since everything I was finding was either out of stock, too form-fitting, or weren't just plain white. Found a good normal pair for $20 though, so I'll just need to add the navy trim to those and they'll be perfect. =]
Now I just need to start planning on how to do her belt, gloves, and goggles.