MLB has introduced special uniforms for the Player's Weekend August 25-27. The players will be allowed to let their personality out with nicknames on the back of their jerseys. In addition to nicknames, we will see players wearing uniquely colored and designed spikes, batting gloves, wristbands, compression sleeves, catcher's masks and bats. Players will be allowed to wear shirts highlighting a charity or cause of their choice during pregame workouts and postgame interviews.
"Additionally, during Players Weekend, the right sleeve of each player's jersey will feature a patch with a blank space for him to write the name of a person or organization that was instrumental in his development. The patch features a new logo that shows a progression of five players increasing in size to demonstrate the process of a player's path from Little League and youth leagues to Major League Baseball. The new "Evolution" logo, which symbolizes solidary with local youth baseball and softball organizations, will also appear on the back of each club's cap and jerseys in place of the MLB silhouetted batter." MLB.com