Toray Industries is giving its signature stretch fabric an eco-friendlier spin. The Tokyo-based firm announced on Friday the launch of a new iteration of Primeflex composed of 50 percent recycled polyethylene terephthalate—better known as PET—and 18 percent bio-based fibers derived from plants. The material, Toray says, meets the sportswear consumer’s “demand for sustainability without compromising stretch.”…