Just a quick question, most Japanese headwear, from the Edo period and before, that isn't ceremonial, military, or fashionable, seems to be most concerned with keeping sun and rain off the wearer. What about cold? We all know that Japan, even parts that aren't Hokkaido, can get damn cold in the winter. So where are the winter hats? The only hats I've seen from the pre-Meiji era and before, even in drawings, that cover the sides and back of the head are helmets. What gives? Did they have something I've missed? Did they just suck it up? Or were their cold weather hats made out of materials that didn't preserve well and considered too banal to be worth depicting or writing about?

Thanks in advance!