MLB Uniform Rules & Regulations
General Uniform Rules | Uniform Fines | Head & Helmet Rules
Shirt & Jersey Rules | Arms & Sleeves Rules | Hands & Wrists Rules
Waist & Belt Rules | Pants & Shorts Rules | Socks Rules | Shoe Rules
Shirt & Jersey Rules:
- All players must wear their uniform numbers on the back of the uniform.
- Jerseys may not be so baggy as to, or otherwise sized in a manner which may, interfere with umpires' ability to make calls.
- Jerseys may not intentionally be untucked.
- Under no circumstances may a jersey be ordered at or altered to a length where it cannot properly be tucked in.
- When any portion of a Player's undershirt is visible, the Player may only wear an undershirt that is in the Club's primary color or the heather gray color supplied by the Club.
- No corporate identification or other logos of any kind are to be visible on any part of the undershirt, except for any Club logo or Major League Baseball silhouetted batter logo.
- A pitcher may wear a jacket while a baserunner. If worn (on the bases), the jacket must be buttoned.
- A pitcher may not wear a jacket while batting.
- No other player is permitted to wear a jacket while a baserunner, a batter, a defensive player, or a coach on the baselines.
Example Shirt & Jersey Violation:
Where does all the MLB fine money go?
| MLB funnels fine money either to a central fund, which is shared among the league's 30 teams, or in some cases it goes to the charity of the player's choice. |