Body Heat Lost Through Head

If this were true, you could walk around in the cold in just a hat and no pants. But that would almost certainly leave you much, much colder than going without a hat. And in much greater danger of being fined for public indecency. But it’s simply not true. Body heat leaves from any skin surface in proportion to the area exposed. So where does this myth come from? This oft-quoted maxim goes back to a 1970 US Army Survival Manual, which strongly recommended covering the head in cold weather, since "40 - 45 % of body heat" is lost from the head." Head heat loss is usually less than 20-30 % of total heat loss, and changes with how cold it is. The lower the temperature, the higher percentage head heat loss. Hardly a majority. And as for people who claim a hat renders shorts acceptable in cold weather?  Let’s just say, “questionable fashion sense!”