The fabric is mostly synthetic or poor quality. Ideally, you would want the fabric to be mostly natural fibers (cotton, wool, angora etc.) rather than synthetic fibers (polyester, rayon , viscose etc.). ... So don't buy viscose if you want to be able to wear the item over and over. Carbon disulfide, a harmful chemical used for the Viscose Yarn but it does not affect the person who wears it. But the works working in the manufacturing unit might get affected. - Anoop Kothari