Proper numbering! Harks back to the time when you had 11 shirts and players remembered who they were without needing their name on it and clubs sold programmes so you knew who was who!
The last time a Premier League team started a game with numbers 1 to 11 was Charlton Athletic on August 22 1998 unless you include the special one off kit Man United wore for the Munich anniversary.. https://squadnumbers.wordpress.com/2014/10/14/1-11-in-the-premier-league-era/ They beat Southampton 5-0. https://www.soccerbase.com/teams/team.sd?team_id=527&teamTabs=results