There are a few rules that you will not find in the rule book or you may find that they are misinterpreted.

The first rule is the Two-Tone Glove Rule, it states that the pitchers glove may not be white or grey and be uniform in color. The pitcher also may not attach anything that is different in color from the glove.

With this previous statement you could ban just about every glove being used today. However the rule of thumb that should be used by the leagues and/or the Umpires is “Does Pitcher’s glove distract the batter” if asking this question, and the answer is yes then the glove should not be used.

Taking this a bit further you can then start with the uniform or shirt sleeve that a Pitcher is wearing. By applying the same question to the sleeves you should be able to ascertain if the color is distracting to the batter.

In either case the glove or sleeve issue needs to be addressed at the beginning of the game/season not during.