There were around ten or so instances here and there of women wearing pants, most or all confined to the first season. Someone posted a picture on the board of all or almost all of them, I think it might have been GSchnitzer, but I'm not 100% sure about that at the moment.
I remember that, too, here it is:
Thanks! Alright, so, that's at least five examples outside the pilots, in three first-season episodes (two at the beginning, and one at the end!).