A detachable insert that simulates the front of a shirt.
1898, Winston Churchill, The Celebrity Chapter 1, I liked the man for his own sake, and even had he promised to turn out a celebrity it would have had no weight with me. I look upon notoriety with the same indifference as on the buttons on a man's shirt-front, or the crest on his note-paper.
(cricket) A term used in cricket to refer to a pitch that is easy to bat on.