Here are two articles from my website that should answer most, if not all, of your questions about what was worn by typical U.S. Navy and Marine airmen in the PTO:
I have read that Army (AAF) pilots were issued the same boots as regular GIs. Some had the opportunity to trade with the Australians for the fleece lined flying boots. They were warmer, but pilots said they tended to fly off at the shock of the parachute opening.
I have read that Army (AAF) pilots were issued the same boots as regular GIs. Some had the opportunity to trade with the Australians for the fleece lined flying boots. They were warmer, but pilots said they tended to fly off at the shock of the parachute opening.
It was not uncommon for Army, Navy, or Marine pilots to purchase a pair of commercially available boots, similar to the RAF 1936 fleece lined boot, made by Bedggood, when on leave in Australia.
You can see some photos of an original pair here, along with some vintage photos of them in use: Page 26