I am guessing that in some places you must tuck in, like at some work places and perhaps at weddings or other places but when there is not a rule and the dress code is not enforced, what looks better? We had the discussion on a subway ride and wanted to see what others thought. Is it a generation thing much like the Social Media Poll? (you can go there and vote still). What if you are a little thicker in the mid section? What if your shirt never stays in? So many questions, enjoy the poll.
There are several videos and articles on this topic of tucked or not tucked.