[RookieDude]

4-34-1

"...A player is one of five team members who are legally on the court at any given time, except intermission."

Situation:

Team members are on the court and ready to begin the game with a jump ball...Prior to the toss, U1 notices A1 has an illegal undershirt on.

A1 is notified that his undershirt is illegal and cannot participate with it.

A1 instantly removes Jersey and Undershirt, in front of bench, as he does not want to miss the tip-off.

You make the call.