Pitching Arm

Originally Posted by canadaump6

The batting glove had some white on it, but mostly black. Heck maybe even a bit of yellow. The arm band had mostly black, probably a bit of white.

FED 1-4-2

ART. 2... For individual players, uniform sleeve lengths may vary. However, sleeves of each individual player shall be approximately the same length and shall not be ragged, frayed or slit. If the pitcher's undershirt sleeves are exposed, they shall not be white or gray. A pitcher shall not wear any item on his hands, wrists or arms which may be distracting to the batter.

It's usually up to the discretion of the umpire. Batting gloves and arm bands are not per se illegal, just a judgment call under 1-4-2 if it is distracting.