Law Four Player's Equipment - Decisions of the International FA Board.
Decision 1
Players must not reveal undergarments showing slogans or advertising. The basic compulsory equipment must not have any political, religious or personal statements.
A player removing his jersey or shirt to reveal slogans or advertising will be sanctioned by the competition organiser. The team of a player whose basic compulsory equipment has political, religious or personal slogans or statements will be sanctioned by the competition organiser or by FIFA.
Players must not reveal undergarments showing slogans or advertising. The basic compulsory equipment must not have any political, religious or personal statements.
A player removing his jersey or shirt to reveal slogans or advertising will be sanctioned by the competition organiser. The team of a player whose basic compulsory equipment has political, religious or personal slogans or statements will be sanctioned by the competition organiser or by FIFA.