Just recently spent a weekend at a '45 reenactment event in Ft. Erie, Ontario. Battle scenarios were held on Saturday and Sunday afternoons, and both were hot days. As I've noted at similar events in the past, the belted plaid is no impediment to running, jumping, going prone, loading and firing a musket, or wielding a broadsword and targe. Nor do you drop dead from heat exhaustion from being so garbed. I don't buy these legends of "plaid shedding" before battles....