Well, you don't generally have to be quite as dressed up as you might be for a pharmacy school interview. In my pharmacy, business casual would be fine. No denim, no strange jewelry, and most importantly, be dressed reasonably conservatively and come in by yourself. I've had more than one job candidate come in this year with tight t-shirts that showed their midriff and/or with their boyfriends/girlfriends in tow. It amazes me that people don't know this already, but I can tell you from experience that they don't.