Grosgrain is a type of fabric by the fact that its weft is heavier than its warp, creating prominent transverse ribs. It is called a "corded" fabric since the weft resembles a fine cord. Grosgrain has a very dull appearance with little luster.

Grosgrain can be made from silk or polyester

Silk Facings used for dinner jacket tuxedo lapels and pocket flaps are made from  silk or polyester fabric