What are the uniform rules?
All players in a team shall wear shirts and shorts that match in color and design in each game. Teams shall have available a light colored and separate dark colored set of team shirts. The shirts shall be numbered with Arabic integral numerals in the range 0-99, with unique numbers for each player of the team. The numbers should be sewn or printed on the backs of shirts and should be a minimum of 20 centimeters high and 5 centimeters wide. They should be located so that they are completely visible and have a sufficient difference in color to the shirt material to allow easy reading. Individual players must use the same shirt numbers throughout the tournament. No numbers are required on the shorts.
 
For more information on sponsorship guidelines, check out the Team and Players Manual