For Volleyball Canada: a team consists of a maximum of 15 players. All 15 players may be in uniform, they may participate in the warm-up, and they may sit on the bench or be in the warm-up area. Only 12 players will be registered on the score sheet and only these 12 players may participate in the match. The 12 players registered on the score sheet may vary from match to match as long as no more than 12 take part in any given match. During the pre-game warm-up, the first and second referee should verify collaboratively the player numbers (if the players are warming up with their game jerseys) and the team staff on the bench against those written on the score sheet. They should also verify the player uniforms at this time.
Because only team members are permitted to sit on the bench during the match and to participate in the warm-up session, no other person(s) can participate in the official warm-up session (Rule 4.2.2).
The team members participating in the official common warm-up session should be primarily on their own side of the playing area. During the official warm up at the net, it is permitted to stay in the opponent’s side of playing area close to the net, to prevent accidents with errant balls, but without disturbing the opponent players.
2. The coach and the team captain (who each check and sign the score sheet or team list for the electronic score sheet) are responsible for the identity of the players listed on the score sheet.
3. The first referee must check the uniforms. If they are not in accordance with rule 4.3, they must be changed. The uniforms must also look the same.
For Volleyball Canada competitions: the referee is to record all uniform infractions on the score sheet and inform the jury. The jury is responsible for enforcing the uniform rule.
For FIVB: Where possible, the shirts must be inside the shorts and if they aren't, it is necessary, at an appropriate moment, to ask the players in a polite way, to put them inside - especially at the beginning of the match and each set. Form-fitting shirts which cannot fit inside the shorts are always acceptable.
The team captain's stripe (8 x 2 cm) shall be fixed under the number on his/her chest in a way allowing it to be clearly seen during the whole game. The referees shall check it before the start of the game.
4. Before the match in due time, the referees must apply a careful cross-checking in order to control if the actual players’ numbers are according to the team roster recorded in the score sheet. In this way any discrepancies which, if discovered later, may disturb the normal flow of the game. This requires (according to the rule text) that the players wear playing uniforms for the entire protocol and net warm-up (Rule 7.2.3).
5. If the two teams appear with uniforms of the same colour, the team listed first on the official program and so listed on the score sheet (before the toss), shall change the uniforms. In the case it is not possible, the first referee should write on the remarks of the scoresheet this situation, but the match cannot be suspended for this reason.
6. Each team official on the bench may choose, based on individual preference, between:
a. Wearing a warm-up jacket or polo shirt or,
b. Wearing a dress jacket or collared dress shirt.
As long as the items are part of the team’s uniform apparel.