I would suggest sitting down with your son and explain that he needs to come in and be responsible with his bodily functions, that he is 16 and not 2. If he insists the wet clothes were result of honest accidents, then suggest he have someone remind him to come in and potty based on a clock. If he chooses not to go along with timed voiding, then you may have to have him wear diapers. If he leaves you no choice, then this is something he must live with, but for him to do nothing, would be wrong for him and you as a parent. he is a big boy and has choices but pants wetting should not be one. I would try the timed voiding and if he refuses then make him wear diapers out sledding. Let him explain to his friends why he is wearing diapers!