diaper wrap

noun2

1. •
   (US, Canada) A diaper, designed chiefly for incontinent dogs, that wraps around the animal's waist.
2. •
   (US, Canada) Synonym of plastic pants (“an undergarment worn over a diaper/nappy (or underwear) in order to prevent leakage through the fabric.”).

   • A diaper wrap which is arranged to enclose a diaper and to extend over the crotch portion and up the front and back of the wearer substantially to the waist line […] — 1951