I once had this explained to me
So sit down and strap in kiddywinks.

To remove heat from the human body we sweat. The sweat comes from our skin. The area of skin is a square function. However, the VOLUME of a body is a cube function. Therefore someone who is "circumferentially enhanced" or "Gravitationally disadvantaged" will have more difficulty removing heat from their body than, say, a skinny fucker because the skinny fucker has to get rid of their metabolic heat AND the added heat from the sun via a greater proportion of skin to mass than a fat bastard.
Old people have difficulty regulating their body temperature anyway (old age is natures way of telling you to die) so added heat or deep cold affects them more.
But going around in a coat? Not recommended unless they have a unique thermal effect of one-way insulation,IE the coat will let heat out but not in. Maybe beige or tartan has this effect?
(Captain Placid 24/7 ball gags, brownie mix and clown porn, Wed 1 Jul 2009, 16:23, Reply)