Textile sustainability covers environmental impact across the fibre lifecycle: raw material extraction, processing, dyeing, transport, use, and end-of-life. FashionFactory rates materials 1-3: 1 (best): organic cotton, linen, hemp, lyocell (closed-loop), recycled wool, alpaca. 2 (moderate): conventional cotton, viscose, modal, cupro, recycled synthetics. 3 (poorest): virgin polyester, nylon, acrylic, polypropylene. Durability and care frequency also affect lifetime environmental impact.