Rubber pants

However, "rubber pants" is still a generic term for any pull-on or snap-on incontinence protective garment.

Some were made of latex rubber that utilized the stretchy characteristic and fit very snugly over the diaper, leaving no air space.

Undersized leg holes and waist opening allowed the stretchy latex rubber to seal against the skin to contain diaper wetness and therefore protect what ever the baby was placed upon.

Ventilation was supposedly provided by two slots (holes) in the front of the pants up near the waist but they did little more than allow leakage onto the bed when baby slept on its stomach.

These modern rubber pants are plentiful and can be found all over the internet and at several large chain stores.