Question regarding sleeve color

[IceGator8]

I was wondering if there are any regional differences between what's ok as far as sleeve color.

Last night my plate ump (who moved into our association from another place) made a pitcher take off his white Underarmour long sleeve undershirt at the opposing coaches request. I didn't challenge my partners decision because half the team was wearing white undershirts and the other half black. We all know that the sleeves of the undergarment must be uniform in color.

My partner stated that if one person on a team is going to wear an undergarment with sleeves then everyone else on the team has to wear them. Our local interp has always been that the players who wear a long sleeved undergarment must wear the same color but it's ok if if a player chooses not to wear the undergarment thus leaving his arms bare.

Anyway, I told him I'd take his argument to the board and get some opinions.

Thanks,

Eric