Viscose rayon, one of the newer high performance rayon's, wrinkles less, can be washed and is also woven into heavy or light fabrics. Washable rayon will state the care on the fabric label. Like silk, if you pre-wash rayon fabric prior to construction of the garment, you have a washable garment. Glossary of Rayon Fabrics Fibranne is French term for Viscose rayon. Velvet , although made from silk, is most often produced from the rayon fiber.
Spandex is more resistant to washing, perspiration, and heat than latex.
Spandex is used in foundation garments and hosiery.