dia·per /ˈdaɪpər, ˈdaɪəpər/

1. a piece of cloth or other absorbent material folded and worn as underpants by a baby not yet toilet-trained.
2. Also called diaper cloth . a linen or cotton fabric with a woven pattern of small, constantly repeated figures, as diamonds.
3. Also called diaper pattern. such a pattern, originally used in the Middle Ages in weaving silk and gold.

–verb (used with object)
4. to put a diaper on.
5. to ornament with a diaperlike pattern.

1300–50; ME diapre < AF dia ( s ) p ( r ) e < ML diasprus made of diaper < MGk díaspros pure white, equiv. to Gk di– di + MGk áspros white

—Related forms
un·dia·pered, adjective

Source: Dictionary.com.

Keeping to concealment Cugel descended the slope, to discover that the pelgrane now pursued a portly black-haired man in a suit of black and white diaper.

Source: Tales of the Dying Earth by Jack Vance.