Another thing to beware of in Coz. If you take an individual taxi anywhere, some drivers may charge you double for the return trip to the ship. Booking through the ship, alleviates that possibility.
Also, though I prefer to to go full bore (boar in the opinion of some, I suppose <L>) for formal night, in order to save luggage space for the Enchantment trip, I packed only one pair of long pants. They were light colored khakis. I wore them to dinner every night, with coat and tie on formal night. I neither looked nor felt out of place. After dinner, I would immediately go back to the cabin and change into shorts.