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

General Uniform Rules:

• All players are required to be in uniform (on the field, in the dugout, and in the bullpen).
• All players are required to wear only Club-issued apparel, outerwear, and equipment during batting practice and in any interview room up to 30 minutes following games.
• No alterations, writing or illustrations are to be made to any part of the uniform.
• Players may not cut or in any way alter the Club-supplied outerwear.
• No field personnel may wear distracting jewelry of any kind. Distracting jewelry includes any item worn by a player which, in the opinion of the umpire, could interfere with the play of the game or umpires' ability to make calls, or endanger the health or safety of a player, including the player wearing the jewelry.
• No pins or other items may be attached to any portion of the uniform (including the cap) or playing equipment.
• Glass buttons and polished metal on a uniform are prohibited.
• Tape or other attachments in a non-matching color cannot be put on uniforms.
• Any "pattern that imitates or suggests the shape of a baseball" cannot be used on uniforms.