Wear whatever the hell you want! Im so sick of Madame Dumkoffer with her steamer trunk trying to dictate what is or is not appropriate cruise attire. Those days are gone. Over. Kaput. I never dress up on a cruise. I simply skip the dining room on formal evening and go to the alternative dining which seems to be very full on the formal evenings. Many people feel the same way about this and they cast their vote by taking the alternative dining option.