There's certainly no hard and fast rules for interviews, and it is probably trickier for women due to more clothing and accessory choices. If you were interviewing for an artistic job or at a fashion company, they'd appreciate some creativity and self expression. However, a professional interview is not the place for that. Some people "get it," and some really don't seem to at all.
You can never go wrong by leaning to the conservative side (picture a senator giving a speech). I'd think that basic womens' clinical dress code for the school is about what you'd want to follow for an interview. Simply imagine how you'd want a female clinician who is treating you to look and keep that as your goal:
-dress suit, dress, or pants/skirt + blouse/sweater
-skirt/dress at least knee length
-shirt/blouse should be collared (tank or tube tops are a bit tacky for professional situations)
-no sharp contrast patterns or loud colors (can't go wrong with dark grays, navy, or brown)
-makeup and hairstyle are up to you, but obviously nothing crazy
-shoes and purse/bag should match and probably be leather
-minimal jewelery (no big garish earrings, rings, bracelets, watch, necklaces, etc)
-absolutely no body piercing jewelry or visible tatoos
I think that eyeglasses are a nice academic touch if you have them. Perfume could be skipped or at least kept minimal. As was mentioned, you definitely don't smell like you fell into a vat of Calvin Klien
. You don't nescessarily have to be "simple looking," but you don't want to be sexually attractive to the interviewer/patient to the point where it interferes with the interaction. You want to look like you are at an interview/clinic, not going out to a dance club...