In 2014, Fifa, the governing body of world football, passed a new rule that banned players from displaying messages of any kind on any part of their kit. With one line of legislation, the undershirt celebration was consigned to history. A new book, _I Belong To Jesus_, by Craig Oldham and Rick Banks has catalogued some of the most significant and controversial of the designs that conveyed messages of devotion, protest, antagonism or humour to supporters. "These direct, sometimes raw…