They just want you to dress professionally. Professionalism is a big thing in the college (they even have a professionalism committee). A suit is the safest way to go. Just think if you were working in a company, what would you wear to work. Once you get in, you have to dress professionally for skills lab which is once a week. There, you aren't allowed to wear sneakers or jeans. People usually wear black pants and a matching shirt. I know this may sound obvious, but women, make sure none of the cleavage area shows.
There were quite a bit of people wearing suits. I wore a skirt, and a white dress shirt with a black formal jacket. I wore black dress shoes as well.
One thing is... don't bring a purse. I brought a purse and they make you leave it in the main room (they lock it though). Just don't bring anything valuable with you. What I started doing this yr. is taking important cards out of my wallet and putting them into a very small bag that fits in my pocket. That way, if anything were ever stolen you would at least have the important stuff with you (ex: debit card). If you really want your cell phone with you, turn it OFF, not vibrate, not silent. There is nothing worse than being in an interview and feeling you phone vibrate (the interviewer could probably hear it too).
Please don't stress yourself too much. Get a good nights sleep, have a good breakfast and relax. The interview is meant to see your personality, not your knowledge. So be as honest as possible and show some confidence in what you say. As a pharmacist, you will be giving recommendations to people and if you do not look confident in your answer, the patient will not likely have confidence in your abilities, which could affect compliance. Therefore, in my opinion, this is an important trait to look for in applicants. You have 8 minutes for each station and you probably won't need those full 8 minutes. I would recommend taking the first minute or so to collect your thoughts and think of a logical way to go about with the scenario/question. They will explain everything to you there and there will be first and second year pharmacy students around to ask for help.
I hope this helps you. I really want people not to be too stressed. Although being a bit nervous is OK. Everyone is nervous at the interview, as long as you control it to let yourself think clearly you should do well.
Good luck