Major League Baseball created an Anti-Hazing and Anti-Bullying Policy that covers the practice. As part of the sport's new labor deal, set to be ratified by both sides Tuesday, the players' union agreed not to contest it.
The policy, obtained by The Associated Press, prohibits "requiring, coercing or encouraging" players from "dressing up as women or wearing costumes that may be offensive to individuals based on their race, sex, nationality, age, sexual orientation, gender identify or other characteristic."
MLB Vice President Paul Mifsud said Monday the new rules resulted partly "in light of social media, which in our view sort of unfortunately publicized a lot of the dressing up of the players .