I'm a Hawaii resident and I wore suits to all 3 interviews, albeit it was damn hot in the 85 degree weather. I tried to cool down and dry up in the AC before I actually went to meet the docs in their offices.
On a side note related to Hawaii... I JUST GOT ACCEPTED!!! And they also offered me a free ride for the first year!!! Ah, so tempting, so awesome!!! Also, apparently they lost my LOR checklist sheet, so I had to redo and fax it in. I got a complete notification email 2 days later, and then my acceptance letter and scholarship letter arrived about 2-3 weeks after that (this past Saturday). I might be an exception because I'm a resident though. Good luck to all!