Today everyone can see that the entire team wears identical uniforms. An entire team wears uniforms of the same color and style. Each uniform must have the player's number on the back. The color of the shirt worn under the uniform must also be a color that represents the team he plays for. During the 19th century, uniforms did not have to be and were not identical. Each role player wore a different colored shirt. Each team also had its own specified sock color. That meant no team ever matched except theirs