Pressure suit history
The stratonaut of today wears about a $500,000 suit of armor against the world. Even Alexander the Great was reported to have used something to protect himself while diving in the Mediterranean Sea. It seems that man has improved the technology in the last two millennia. The history of the pressure suit in the last 100 years is fascinating. Some of the early photos of pilots in their suits are almost laughable, but that was the state-of-the-art for the time. Aviators need to do more than simply put something over their head to breathe at altitude and overcome the loss of atmospheric pressure.