As a guy I tend to notice. And am guilty of staring a little too long.
Seems to me bare legs are common in the summer probably due to the heat. Panty hose or stockings (impossible to tell without shoe mirrors) are winter apparel.
There. I’ve exposed my ignorance. It’s all I know on the subject.
In the past we didn’t go bare-legged for work or special occasions, even in Summer. It was sort of vulgar.