On my HAL Zuiderdam January 2nd crusie I saw a man turned away. However on my Westerdam cruise in April 2008 I had a table mate wear jeans to dinner. Now she had on a nice pair of jeans teamed with a silk cami and shrug. The man's jeans looked like "work on you car" jeans. Perhaps that made the difference, or perhaps it depends upon whom the head waiter is on ship, and if he enforces the rules.
Equal opportunity cruiser since 1998-4 Carnival, 4 RCI, 3 HAL, 3 Princess, 5 Celebrity, 3 NCL, 1 Disney
I have now achieved-
ONE HUNDRED DAYS ON A CRUISE SHIP!!!!!!!!!!
146 days total