I currently fly for a Police Air Support Unit, where the dress code whilst flying is Nomex flying suit ,bone dome, leather gloves and boots. I'd much rather wear white shirt, dark trousers, headset and comfortable shoes (!) and NATO sweater in the winter. Rumour has it that the most dangerous phases of a helicopter flight are the take off and landing. I did far more ad- hoc landings/takeoffs doing public transport/corporate flights than I do now. If I were dressed then as I'm expected to dress now, half my passengers would have elected to go by road.
Personally, I think the main benefit of wearing all the kit that I'm expected to wear in my current job, is to make identification of the remains easier if I'm involved in something unpleasant.
RC