Didn't you choose stockings instead of tights (pantiehose I think our US friends call them) for other reasons?
Surely no woman wants to spend too much time in the bathroom fighting to reattach their stockings after a pee? Yes I know, you can tug the panties sideways, leaving the stockings in place, but doesn't that make it difficult to use a tissue?
As a man, there are other advantages...using panties as a glove is a very erotic activity...slipping them back up her legs can be as arousing as sliding them down.
I know where I stand on the issue, what about you?