I for one, lament the days where folks dressed a little better in general, in general on flights, and particularly in first class. I still do this (not necessarily a coat and tie, but business casual), including international travel, and think I get treated better when I "look like I belong there." I also do not like it when people put their feet up on the bulkhead, but that's another story. I am realistic enough not to argue the point these days, but thought I would weigh in.