echo..echo..echo...pretty much what everyone else said. wear whatever you want--only students will see you and, trust me, we don't care what you're wearing. i'm currently an M3 and had extensive experience with the program M1/2 years. i also did the program as a prospie and thought it was a great way to see the "other side" of the school; in fact, i picked MCW due in large part to my experience with the applicant host program and interactions with the student body.
as for Laura's ?: I think this friday is our last interview day, but we traditionally interview late into the season and take a large number of people from the waitlist (both of my roommates interviewed in MAY and were accepted in early summer, and both are now excelling, so don't let the waitlist stigma fool you.) good luck with your interview. peace.