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Policy in new CBA will affect teams' rookie costume tradition

Tucked into Major League Baseball’s new Collective Bargaining Agreement is an anti-hazing and anti-bullying policy that will put a stop to some of the costumes players are made to wear late in their rookie season.

The new rule prohibits teams from "requiring, coercing or encouraging" players to engage in activities that include "dressing up as women or wearing costumes that may be offensive to individuals based on their race, sex, nationality, age, sexual orientation, gender identity or other characteristic," according to an Associated Press report.

In many major league clubhouses, it is a tradition to have rookies dress up in elaborate costumes – from superheroes to schoolgirls, from Gumby to Ghostbusters – late in the season, often during their final road trip of the season.