Al Oliver wore it when he played for the Montreal Expos ("O" get it?) and Walter McCarty and Gilbert Arenas have worn it in the NBA.
An old time NFL legend called Wilbur Henry wore it back in the days when the league sold franchises for about twenty-five bucks to shoe salemen in thriving burgs like Pottsville and Decatur. Stories go that Henry, a defensive lineman, got the first recorded sack of Brett Favre back in 1926.