Why do women wear skirts that leave the knees bare?
Skirts below full length became very popular in England during WWII, because of the severe shortages of fabric for clothes. That was in fact the first time it was really socially here acceptable. More than that in fact: it was a sign that you were doing your bit for the war effort by not engaging in excessive consumption.
So, the knees/no knees thing is relatively recent. Once that damn was broken it appears that the length became less and less important.
still: Why do women wear skirts that leave the knees bare?
Why not? It's more comfortable in hot weather and many people believe it looks better too.
I was taught that one ought to cover oneself from the shoulders down to at least the knees.
By whom and according to what logic. I'm sitting here slacking in my office (you can tell I'm slacking since I'm writing this post) wearing shorts and a T shirt. My knees are most certainly visible.