I have never seen a woman out wearing just stockings.
Probably because they are also wearing a dress or skirt as well, covering the stockings.
Of course women still wear stockings, they just don't feel obliged to let everyone else know they are wearing them
I regularly wear stockings or hold ups out and about.
But like others have said I also wear a dress or skirt over them.
OP how are you expecting to know whether a woman is wearing them or not?!