This seems a good place to leave this: https://247sports.com/nfl/dallas-cowboys/Article/Ezekiel-Elliott-Dak-Prescott-fined-big-for-wearing-sleeves-126474751/Amp/
"So, why are the sleeves a violation?
Well, according the Article 4, Subsection J of the Uniform Policy, the sleeves don't match the team color, which is blue for the Cowboys -- not white. For example, wide receiver Cole Beasley has been spotted wearing sleeves multiple times in the past few weeks, but they were blue.
Are you effing kidding me?
Come on, man. We aren't talking about purple cleats or polka dots here.