One of the characteristics of severe hypothermia is shedding the clothes you're wearing. I've never heard of a heatstroke victim pulling off their clothes; though I can't claim a lot of experience in this theatre. I have successfully rescued a victim of anhydrous heat exhaustion; a young marine reservist who had failed to drink his mandatory quart an hour while sitting in a tank's turret. He had ceased to sweat and became faint. I and a couple of Marines got him out of the turret, stripped him to his skivvies and pour5ed water over him on the medevac chopper to cool him. His core temp was 98 even when we arrived at the Battalion Aid Station. A close one.