I tend to favor natural fabrics--those made from materials such as cotton, flax, silk, or wool--but I do buy the occasional irresistible piece made of polyester or nylon. And I absolutely adore my knits with a little bit of lycra. But the one fabric I've always been a little on the fence about is rayon, specifically bamboo rayon. I am very much in favor of organic textiles and the sustainability of resources, and while bamboo itself is a fast growing and seemingly perfect source of textile fiber, the process leaves much to be desired.
Technically, it's made with a natural substance (bamboo pulp) but it is processed in such a chemically intensive way that it almost seems synthetic. A blog post I found on OrganicClothing.blogs.com gives a pretty good account of how bamboo is processed and made into fabric, and frankly, I have to say that that is alot of chemicals.
Feel free to comment and tell me what you think.