Good Morning- We are leaving Sunday for a 7 day Southern Carribean cruise on HAL's Westerdam ship (I can't wait!!). We have sailed with Royal Carribean and Princess previously. My question is surrounding men's dress attire during the informal nights at dinner. HAL's website says that men must wear a jacket to dinners- is this true? In practice do most men wear golf shirts or buttoned shirts to dinner instead of a suit jacket to informal dinners in the main dining room? Any insight would be greatly appreciated!