The shirt-in or -shirt out issue is one of the most difficult to deal with, since Welt worry. For years I have worn them out. From what I see on the net, this is largely a crime. And my age must be considered in any decision I make. I am planning a whole summer (such as it is) to wearing in. I am thinking of dark blue chinos, red Tricker's and a white shirt. tucked in, for one day each week.
Let's not re-visit the Welt Wars….
Boston, you make a good point.
Other factors include age and setting. Casual is very often untucked out here.
Munky, blue chinos, red Tricker's and a white shirt would be particularly apropos in the States on July 4th! : )