The starting pitcher is given the choice of jersey
The Negro League Baseball Team who had the initials BB on their uniforms were the Birmingham Black Barons
Rawlings manufactures the majority of uniforms for teams in Major League Baseball. I do not think that all teams contract Rawlings for uniforms, but I believe that they do have roughly 70% of teams using their uniforms and equipment.
Yes
None
Themselves
The players get new uniforms for each game!
majestic
they all use a bat, a baseball, 9 positions, a coach, a field, bases, and uniforms
According to the official MLB rules, section 9, umpires are required to wear a uniform, but it does not describe what the uniform is. It is safe to assume that they all have to appear in the same clothing (hence uniform), and it cannot be deceptively similar to one of the teams' uniforms.
They wear majestic uniforms on the field
Oakland Athletics
The 1916 Cleveland Indians who had the number on the left sleeve of home uniforms.