Proper Tennis Attire

Q: What is the proper tennis attire to wear for USTA tournaments?

A: No T-shirts

Non-Officiated Matches

Q: In an tennis match with no officials present, who calls touches, throughs, and not-ups (double bounces)?

A: The player who commits the infraction, NOT the opponent.  If the opponent stops play and makes the call, but the the other player denies it, the opponent (who stopped play) loses the point.