Rayon is considered a manufactured fiber, but it is actually made from tree cellulose. Rayon in upholstered fabrics makes for a good hand, meaning it feels good to the touch. It is soft and comfortable and drapes well. It can add a nice shine to chenille.
Rayon does not hold its shape well. It can stretch, so it is often blended with other fabrics. Blends help maximize the best characteristics of each fiber. If durability important, play close attention to ratios of rayon to other fibers such as polyester which will add to stability.