We were on the Holiday in Feb 2005, and saw everything from shorts and t-shirts,totuxedos inn the dining room for dinner!!! As far as the Captain's dinner, it seemed to be a little more dressy. Can't remember seeing anyone with out a shirt and tie. Don't forget to ask for a beer if you want one, they will accomodate you. I'm not a rum drinker, and it seemed like most of the free drinks were made with rum. Happy sailing!!!