How were the costumes different for the female crewmembers?

Dr.Crusher, though very attractive and quite beautiful, had to have a kind of formality that the empath didn�t, since she was civilian, so we could play around with her necklines, we could give her a little bit more sensuality, because she wasn�t officially a member of Star Fleet.

Of course, as the series went on, she then went into Star Fleet and she just went into a standard medical uniform.