The last 5 years have seen a pronounced increase in excitement around “biomaterials” for the fashion industry. As brands consider their environmental and social impacts, along with rising ethical concerns from consumers, the search for more ‘sustainable’ alternatives is driving innovation. Wider trends are further contributing to interest in biomaterials; from climate change and the potential for lower carbon footprints vs fossil based synthetic materials, the war on plastics, to the rapid growth of veganism1 and a rush to find alternatives to animal derived materials. Biomaterials, however, remain an ill defined category.