This may need to be clarified by Richard Salyers. He knows the rules better than anyone I know. One of the reasons we started weighing in singlets was because girls were also weighing in and this keeps the boys from having to weigh-in naked. When we weigh them they are asked to pull their singlet off the shoulders to look for worms, the girls are checked at a different location by a female. If the kid was dq'ed for a worm that was in a spot normally covered by the singlet, I would say the ref is asking for trouble.