flying helmet

flying helmet (plural flying helmets)

1. A leather head covering with earflaps used by early aviators.
   • 1980, Bill Oddie, Bill Oddie's Little Black Bird Book, page 61:

     This is another area in which it's hard to tell the dude from the twitcher, as ratting caps and deerstalkers, flying helmets and even toppers are considered acceptably eccentric.