from a man's point of view

my wife got good results out of most of her interviews, and she never
wore skirts. I didn't pay attention to these woman dressing things
until recently a visiter to my department showed up in black suit and
knee length skirt. she has long legs and when she stand while we sit
in a small room, things went a little bit flirting and leave me very
negative impression...

after that I paid more attention and realized most women still wear
trousers for interview/presentation, and looks fine for me.

good luck!