These are standard issue Regia Aeronautica flying trousers. These trousers were worn by Maj. Gen.Alberto Briganti. Briganti commanded Italy's north western aerial defense Zone 1, or Squadra 1 (SQA1). The protection of Italy's industries centered at Milan was Brigant's primary concern.
This object is not on display at the National Air and Space Museum. It is either on loan or in storage.