Well i can say on this point, last year the umpire made a player on our team color the logo from white to red to match the label. The white letters were the problem on the glove. So i guess it is up to the umpire.

Rule 6-2 Art. 1 Infractions by pitcher Illegal acts include

 

f. Wearing any items on the hand, wrists or arms that may be distracting to the batter

 

h. wearing a glove/mitt that includes the colors white or gray

i. wearing exposed undershirt sleeves that are white or gray

 

penalty for the above violations : the infraction must be corrected before the next pitch. In (f) the umpire is the sole authority to judge whether or not an item is distracting and shall have that item removed.