American Football NCAA Rule 1-4-5-b and c
b. Color.
1. Players of opposing teams shall wear jerseys of contrasting colors. Players on the same team shall wear jerseys of the same color and design.
2. The visiting team shall wear white jerseys; however, the home team may wear white jerseys if the teams have agreed in writing before the season.
3. If the home team wears colored jerseys, the visiting team may also wear colored jerseys, if and only if the following two conditions have been satisfied
a. The home team has agreed in writing prior to the game; and
b. The conference of the home team certifies that the jersey of the visiting team is of a contrasting color.
4. If on the kickoff at the start of each half, the visiting team wears a colored jersey in violation of the conditions specified in paragraph 3, it is a foul for unsportsmanlike conduct.
PENALTY—Administer as a dead-ball foul. 15 yards at the succeeding
spot following the kickoff. If the kickoff is returned for a touchdown, the penalty is assessed either on the try or on the succeeding kickoff, at the option of the home team. [S27] In addition, Officials shall charge a team timeout at the start of each quarter the illegal jerseys are worn, or a foul for delay of the game if all timeouts have been used.
5. If a colored jersey contains white, it may appear only as any of the items listed in paragraph a-2 above.
c. Numerals.
1. The jersey must have clearly visible, permanent Arabic numerals measuring at least 8 and 10 inches in height front and back, respectively. The number must be of a color that itself is clearly in distinct contrast with the color of the jersey, irrespective of any border around the number.
2. Teams wearing jerseys/numerals that do not conform to this rule will be asked to change into legal jerseys before the game and before the start of the second half. On the kickoff at the start of each half, if a team wears a jersey in violation of the conditions specified in paragraph 1, it is a foul for unsportsmanlike conduct.
PENALTY—Administer as a dead-ball foul. 15 yards at the succeeding
spot following the kickoff. If the kickoff is returned for a touchdown, the penalty is assessed either on the try or on the succeeding kickoff, at the option of the home team. [S27] In addition, Officials shall charge a team timeout at the start of each quarter the illegal jerseys are worn, or a foul for delay of the game if all timeouts have been used. (A. R. 1-4-5-I)
3. All players of a team shall have the same color and style numbers front and back. The individual bars must be approximately 1-1/2 inches wide. Numbers on any part of the uniform shall correspond with the mandatory front and back jersey numbers.