There are several online places that sell cloth diapers and plastic pants for bigger kids, teenagers, and adults.
We have used it on our 14 yr old girl for talking back, being disprerpectful, and lying to us about not doing her homework and getting a poor progress report.
Once the 15 year old is in the diapers and plastic pants,she should be given a pacifier also and be made to suck on it.
Bariatric Briefs are for plus sized individuals, go up to very large waist sizes.