What color undershirt must a player wear if they are wearing a white shirt with black sleeves?

The requirement for the color of the undershirt is tied to ensuring proper visibility and conformity with the uniform standards set by the governing body. In this case, if a player is wearing a white shirt with black sleeves, the undershirt must predominantly match the color of the sleeves to maintain a cohesive appearance and help differentiate the players from officials and other personnel on the field.

Choosing an all black undershirt aligns with the black sleeves of the shirt, ensuring that the entire ensemble is visually consistent and meets the uniform regulations. This is important for clarity during the game and assists in the overall aesthetic and function of the team's appearance on the field. Other color options would disrupt this visual continuity and potentially clash with the shirt design. Therefore, the black undershirt complements the black sleeves appropriately, making it the suitable choice.