https://www.espn.com/mlb/story/_/id/36304568/mlb-tells-braves-stop-celebrating-home-runs-big-hat
"The Atlanta Braves have been celebrating home runs with an oversized hat this season, but that has been put to a stop after a complaint from the league's official on-field hat manufacturer.
The Braves said they can no longer sport the oversized baseball cap to celebrate home runs after complaints from New Era, who did not manufacture the big hat being used by players in the dugout."