Thank you for the information. That explains why I can wear tencel but absolutely can't wear rayon. Do I understand correctly that the feel is different depending on the processing and if it feels like the tencel dress that I have it should also be okay for me? I am also allergic to petroleum products from nylon to plastic which is making life somewhat unfun. Clothing except for underwear is easier than glasses, steering wheels and laminated floors and linoleum. Do you know if they give off chemicals or something in the air as well?