Just got back from a Viking tulip cruise. On our Rhine cruise 4 years ago there were people every night who wore suits and dresses to dinner. This time, folks just seemed to keep on whatever they wore for the day. There were some jeans, but nobody looked like slobs. Some threw on a sweater or scarf to dress up their upper torso, but that was it. I don't believe I saw anyone wearing a suit, sports jacket, or dress.