I was lucky enough to be let into the UAS recently, after a few hundred hours of jeans and t-shirt clad civvy glider and light aircraft flying. So flying in all the RAF clobber has been a bit strange to say the least- bone dome (makes you neck ache a bit at 4G), grow bag, gloves, jacket, ridiculously enormous boots, and longjohns....yes, longjohns!!
(dress to survive they call it) Suppose I'll get used to it eventually- the grow bag is really usefull with the knee-pads and pockets though, and very warm.