G-1 military flight jacket
The "G-1 Flight Jacket" is the commonly accepted name for the fur-lined-collar flight jacket used by Naval Aviators in the United States Navy, Marine Corps, and Coast Guard. It began with a completely new jacket specification on 28-Mar-1940, the M-422, and has been issued to this day; now in the current MIL-DTL-7823F iteration.
Source: Wikipedia — G-1 military flight jacket (CC BY-SA 4.0)