Jerseys during Warm-ups

[KCref11]

[QUOTE=bob jenkins;1015117
IIRC (and my memory might be as faulty as Billy's), this all started with VB where the girls would (and still usually do) wear warmup tops, and then change into the jerseys later. They would do this at the bench, showing the sports-bras to all the HS boys.
[/QUOTE]

This was the only reason I attended girls VB games back in the day. That and spandex shorts

[BillyMac]

For the good of the cause:

2005-06 NFHS Basketball Rules Changes
3-4-15 Prohibits a team member from removing his/her jersey and/or pants/skirt within the visual confines of the playing area. The penalty is a technical foul.

COMMENTS ON THE 2005-06 RULES REVISIONS
JERSEYS/PANTS/SKIRTS PROHIBITED FROM BEING REMOVED (3-4-15, 10-3-7h, 10-4-1h): A team member is prohibited from removing his/her jersey and/or pants/skirt within the confines of the playing area. The penalty is a technical foul. The former uniform rule didn't require team members to actually wear the team uniform. This addition also addresses a growing behavioral concern of players removing their jerseys to demonstrate frustration or anger and as a means of attracting individual attention. The rule is intended to be applied in all situations - even when a player must change uniforms due to blood or other unusual circumstances. It is not unreasonable to expect team members to go to their locker rooms to change their jerseys.

2005-06 NFHS Basketball Points Of Emphasis
1) Sporting Behavior
A) Uniforms
Players are increasingly using their uniforms in unsporting ways. Examples include: Holding the uniforms out from the chest area to display the team name to the opponent or fans; pulling the uniform out of the shorts in an emotional display; and removing the jersey either on the court or near the team bench, especially after a disqualification. The committee expects jerseys to be worn properly and remain on. New Rule 3-4-15 adds, “A player shall not remove the jersey and/or pants/skirt in the confines of the playing area”. The result is a technical foul. Uniforms must be worn as intended and the rule must be enforced. The jersey must be tucked in and the shorts must be worn properly. When a player is in violation of the rule, the player is directed to leave the game. While an untucked jersey during the normal course of play is understandable until it can be corrected, too often there are multiple warnings for clear violations. Coaches bear great responsibility in ensuring uniforms stay on team members. Official must enforce the rule.