a suit is always good bec. if you find yourself being overdressed, you can remove the coat to sorta mitigate this... long sleeves and tie ain't too bad. but either way, remember not to sweat it... your clothes aren't the point of the interview... they're important, but if you do come overdressed, the ability to laugh it off, and joke about it with the interviewer will still get you brownie points...
THIS ... !!!!
INSEAD Sept 2010 Interview Invite Nov 5, 2009 Admit & Matriculating
Wharton Sept 2010 Interview Invite Oct 30, 2009 Waitlisted & Ding
Harvard Sept 2010 Ding without Interview
Ivey May 2010 Interview Invite Nov 23, 2009 Admit + $$