MycoWorks makes is Reishi leather with mycelium, which can produce mushrooms. Pol Rebaque/MycoWorksMycoWorks makes alternative leather from mycelium, the network of fungus that can become a mushroom.The company will open its first commercial plant in September to supply luxury brands like Hermès.Fashion brands are investing in materials that don't use animals or plastic to meet climate goals.This article is part of Insider's weekly newsletter on sustainability.