Business casual is usually the norm. Neutral colored pants (obviously no jeans) and as mentioned above, a modest top is super important. Make sure that when you squat to the ground, that your back is covered and that when you bend over forward, you're not completely exposing yourself. Some clinics that I have observed in/had practicum in are particular about no sheer/see through shirts (like the ones we all wear camis under), so that may be something to be mindful of. Also, keep jewelry to a minimum.