Anyone familiar with cloth diapering has most likely heard the term "rubber diaper", or "rubber diapers" before. It's slang for rubber pants. Children are famous for calling rubber pants "rubber diapers", as one of my daughters did.
Mrs. Smith was in changing diapers on the baby and called out to Mrs. Jones to bring her in two diapers, and a rubber diaper.
by Lorraine Jorgenson. August 6, 2006