I used to be one of the people who wore shorts even during the depths of winter. I’m not sure how it is in other parts of the world, but in the Midwest of the US, it is fairly common to see such folk, frequently masculine in appearance (but not limited to that by any means) trudging through blizzards and all but the worst wind chills. It always made sense to me, given that I spent most of the winter indoors, in buildings with their heat set for people who needed a higher external temperature to be comfortable. I didn’t want to attempt to change the ambient temperature for my comfort alone, so I started wearing shorts and upperbody layers that were easy to remove (zippered hoodies, mostly) so that I could be comfortable. It wasn’t that I was immune to the cold outside, just that I was willing to endure a few minutes of being uncomfortable in order to spend two hours in class or at work without needing to fight off sweat or the sleepies.