When I did a horticultural course at the local Hortic college, I still remember the lecturer bringing in a pair of chainsaw trousers which had been worn at the time a chainsaw slipped. They did their job by completely stopping the chainsaw blade from cutting through all the way, and saved the person from any injury.
It's at least 15 or 20 years since I did that course, but it's stuck in my mind since then. A must-wear.