This is a WWII US Army Air Corps pair of flying pants A-9. These pants were worn by the pilots and crew of the bombers. During missions they would have to fly at high altitude to avoid detection. Temperature in the aircraft would fall to below zero. Wearing the appropriate clothing became the only way to survive.

Of cotton construction. Lined with heavy wool. Green color with Army Air Corps stamp on white ink. The pants have a black tag with golden letters. The tag contains information sucg as contract number, manufacturer's name, etc. Some of the pants may be missing the tag due to normal use.