Originally Posted by SuitedDx
Although my legs don't typically get cold (I wear shorts while running unless is <40) heavier pants should be considered if you spend time outside.
I wear shorts when running in chilly weather, too. But the very act of running tends to keep me warm. If I were... I don't know, maybe standing at a bus stop in Duluth, MN, on a cold winter day... I probably wouldn't be comfortable in shorts. More likely, I'd want to be wearing full-length pants. And something closer to corduroy than to linen, at that.
And as for layering, it tends to lend itself more to the upper body, than to the legs. (Yeah, there's long underwear and full-length coats, but I still maintain that layering is generally a more practical upper-body solution, than it is a lower-body one.)
In practice, I could often get by with much the same weight clothing in the depths of winter, as in the dog days of summer. Since it's pretty uncommon that I have to spend a lot of time outdoors on a workday, my car has a good heater, and most places seem to be heated such that they're even a couple of degrees warmer in January, than they are in July. Still, these practical matters aside, you won't find me wearing seersucker in winter, or winter-weight flannel in summer. Because that's simply not how things are done. (Many norms of behavior, dress, speech, etc., after all, have little to do with modern day practicality.)