What I noticed in January on the Magic, mind you I didn't check everyone out, was generally everyone was dressed nicely for supper. Depending on the night, I personally went with black or khaki pants and a button down shirt and maybe a tie. I really haven't noticed a lot of people dressing down too far on any of our cruises. The only thing that I have noticed is not a lot of formal wear or jackets on formal night, but I am guilty there too, we stopped packing my jacket after noticing that the first thing I did when I sat down to eat was to take it off and set it on the back of my chair.