We all know the images of people covered from head to toe. Even if the clothing doesn’t always make sense to us, it is notable how much skin is hidden. Why is that?
Temperatures, on average, were not that much different than they are today, despite the little ice age of the later middle ages. The prohibitions on indecency were, perhaps, stronger than they are today, particularly when it came to covering heads for modesty. At the same time, there are many images of people exposing themselves (though usually they are surrounded by fully clothed people, or they are exposing just a bit of skin).
I have settled on three main reasons, listed here in the order that they matter to me.
a) bugs – In the absence of insect repellents, layers of clothing would help prevent people being bitten by horseflies, deerflies, blackflies, mosquitoes, etc. This matters when most people live in rural areas. They probably wouldn’t do much against lice, fleas, or bedbugs, though. This one matters to me a lot, after getting bitten about 130 times early last summer while on a long swim at the lake. (I am one of those people who react badly to bug bites)
b) farm work – having spent time helping to store hay, I can assure you that it is hot, itchy work. The first time I helped, I wore capris and ended up with very itchy scratched-up legs. The second time, I wore long pants but a short sleeved shirt. My arms were covered with more scratches and I had bits of hay everywhere. Imagine doing this kind of labour all day, every day, as most people would have done!
c) sun protection – Covering up is a good way to protect the skin. That’s not really news, but it struck me, again, as I looked at the farm-hand helping us with the hay. The skin on his arms, face and neck was almost black, compared to its usual winter shade of pale. It turns out that farmers have relatively lower overall rates of cancer, but higher than average rates of skin and lip cancers. Did medieval people understand the link between exposure to the sun and skin cancer? Not in the way we know it today thanks to scientific research, but they may have observed the pattern. Since it coincides with the pattern that says pale skin equals greater wealth and less need to work, covering up may have made sense for several reasons. Also, loose, breathable clothes that cover the whole body (including the head) are actually cool and comfortable – better than stripping down to shorts and a tiny shirt.