As fashion historians point out, medieval linen-armourers had long made padded undergarments that fitted beneath suits of armour, reducing a little the discomfort of wearing plates of steel.
A ceramic armour called Dorchester Level 2, used on British Challenger 2 tanks, is reportedly at least three times as resistant to some strikes as the same weight of steel.
If you go to Switzerland, and you have iron, steelarmour around you, you will not be changed because your steelarmour will carry its own climate within.