I found an old airforce flight suit from an army surplus store for around $25, first one i got was snug around crotch/sholders when standing up, sleeves were a bit short at the wrists, was able to take it back and get one about 2 sizes bigger and still a pain to get on, but fit much better, tad bit baggy but once tucked into boots and/or bracers, with being under a vest it should do the job.