I saw this ad the other day and thought it was ... interesting.
This is pretty clever, but I can find many flaws. First, what's to prevent the lad from grabbing a pair of scissors and going at the lace? Also, what about gym class? And what if he bent over and his shirt became un-tucked?
It is a pretty clever solution, but I feel that the shirttail issue is a little outdated. Here's what we need nowadays: