Funny how the NBA has basically the same rule and nobody complains about it.
You can see the rule in the NBA's official rulebook, under the “Player/Team Conduct and Dress” section, on page 61.
H. PLAYER/TEAM CONDUCT AND DRESS
(1) Each player when introduced, prior to the game, must be uniformly dressed.
(2) Players, coaches and trainers are to stand and line up in a dignified posture along the sidelines or on the foul line during the playing of the National Anthem.
(3) Coaches and assistant coaches must wear a sport coat or suit coat.
(4) While playing, players must keep their uniform shirts tucked into their pants, and no T-shirts are allowed.

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