At the risk of angering some, I will tell you how we dress: I wear a nice long gown with nice jewelry and my hair up. My wife, who is "Butch" will wear a nice white shirt (she has two and one is a "tux" shirt, black pants and nice leather shoes. If it's chilly, she will wear a jacket but that's only 50% of the time. We both look very nice and we've never gotten "stares" or been asked to leave the MDR. I think, if you make an effort to dress up - to what ever your degree of dress up is - you will be fine! enjoy your cruise!!!