“Their clothing was designed to be shown off indoors around the fire,” says textile researcher Annika Larsson.”
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My experience is that the front is warm near a fire and the back is cold . . . but then again they say that Socrates went without shoes in the snow in Athens so maybe they were tougher in those days.
Alexander made his men bathe in cold water to toughen them up.
And he had soldiers near the end of his campaigns who were in their 60s. Foot soldiers, not some general in the command tent, either.