Learn how to say Denim correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word denim:
a hard-wearing cotton twill fabric, typically blue and used for jeans and other clothing.
(denims) jeans or other garments made of denim:
a pair of denims
late 17th century (as serge denim): from French serge de Nîmes, denoting a kind of serge from the town of Nîmes