The term 'Lustrous Material' can be summarized by two crossword solutions: SATIN (5 letters) and Sateen (6 letters). SATIN is a smooth, glossy fabric with a dull back, usually made from silk or synthetic fibers. It is often used in clothing, upholstery, and drapery. Sateen is a type of cotton fabric with a glossy finish and a soft, silky feel. It is often used for bedding, curtains, and other home decor items.