by bomber and high-altitude meteorological aircraft While fighter pilots were limited in cockpit space, RAF bomber crew could add insulated Irvin leather sheepskin jackets and trousers over their flying suit.

By the time World War II started in earnest, electrically heated suits were introduced by in conjunction with General Electric for patrol and bomber crews who routinely operated at high altitudes above 30,000 ft, where air temperatures could get so cold that flesh could freeze instantly to any