Penny; You will find a lot of variation in dress on casual nights. A nice sport shirt and slacks is the norm, but you will find a lot of men wearing sport coats simply because it can get a bit chilly in spots on the ship. The Mariner is OK, but I highly recommend a sport coat on Voyager unless they've corrected the A/C balance. On informal nights a sport coat with or without tie is the norm. You'll probably want a light wrap for yourself in the evening. Lynn always takes one and usually wears it, but her body fat is only 12%.