The two crossword solutions for the term 'underwear material' are LACE (4 letters) and TRICOT (6 letters). LACE is a delicate fabric made of yarn or thread in an open weblike pattern, often with scalloped edges. It is usually made of cotton, nylon, or polyester. Tricot is a lightweight, stretchy fabric that is usually made from wool, cotton, or synthetic fibers. It is often used to make lingerie, underwear, and sportswear.