The way I look at this, I paid a lot of money for this vacation, its my vacation, I am going to wear what I want and I don't really care what anyone else thinks. I will never see any of these people again. We don't do dress up at home, its just not us. I don't even have dress up clothes, why would I go spend money on clothes to wear one time and then have to pack them. Some people like to dress up and they do look very nice. Its your vacation, do what makes you comfortable and stop stressing about what others may think.