"Matelasse" is a French word that is pronounced "maht-luh-sey." Dictionary.com has an audio file of the word pronounced by a native French speaker. The word derives from the French words "matelasser," to quilt, and "matelas," mattress. In French, it is spelled with an acute accent over the final "e."
The word "matelasse" commonly describes a fabric that has an embossed or raised design. The surface of the fabric appears puffy or cushioned although there is, in fact, no padding. Matelasse fabrics have an elegant appearance and are generally used for bedspreads, pillows and pillow covers, shams, duvet covers, coverlets, and upholstery.