Vegan fashion excludes all animal-derived materials: wool, silk, cashmere, alpaca, angora, camel hair, leather, suede, and fur. FashionFactory's 'vegan' constraint eliminates these fibres from rankings. Vegan alternatives: Tencel/lyocell, organic cotton, linen, recycled polyester, Econyl, Piñatex (pineapple fibre), or mushroom leather for accessories. Vegan fabrics can achieve high breathability and formality scores; the key gap is insulation (no wool) — often filled by recycled synthetics.