Honestly? When I have seen a man dressed in a Tommy Bahama type shirt in the MDR I have always thought that he does not know any better. Harsh, I know--but that has been my thought. Looking back at the male model pictured in the white and black shirt--he looks just ok--and he is model.
I am not a stuffy person and live half of my time on a rural farm in Texas wearing extremely casual clothing. But, we do know how to dress for the venues and occasions that present themselves. I have read so many comments from those who say, "Look, I'm on vacation--I don't want to dress up." I totally understand that. At the same time, there are people CHOOSING Seabourn because people DO dress up and they like that. I'm just stating a fact here. I don't know the answer, but I see a trend toward dressing down on Seabourn. Some of those who prefer to dress only casually have disdain for those who like to dress up and vice versa. There are those who say, "how does how I dress affect YOU?" Well, it does--because the ambience of a place (like the MDR) changes when men are wearing casual shirts meant for outdoor picnics and beach dinners.
It is an interesting situation that I have not seen in very many places. This seems to be more apparent in how men dress.