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!
They wear majestic uniforms on the field
Oakland Athletics
San Diego Padres
they all use a bat, a baseball, 9 positions, a coach, a field, bases, and uniforms
The 1916 Cleveland Indians who had the number on the left sleeve of home uniforms.
The Brewers.
The New York Yankees were the first.