Rayon, from cellulose, has many of the qualities of cotton, a natural cellulose fiber. Rayon is strong, extremely absorbent, comes in a variety of qualities and weights, and can be made to resemble natural fabrics. Rayon does not melt but burns at high temperatures.
Rayon drapes well, has a soft, silky hand, and has a smooth, napped, or bulky surface. Rayon will wrinkle easily and may stretch when wet and shrink when washed.
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.
Also read Japan Chemical Fibres Association - Rayon