There are several great books written about the fashion industry impact and possible solutions towards a more sustainable future. My personal recommendation is to start with Fashionopolis by Dana Thomas - one of the most comprehensive books to help you understand better the key issues and discover ways to become a more conscious consumer or a more sustainable brand. I also strongly suggest to read Cradle to Cradle by William McDonough & Michael Braungart - an introduction to the concept of "circular economy". It is not about fashion per se but I promise, it will change the way you think about fashion or other products all around us and inspire you to think beyond just "sustainability" but rather imagine the world where everything is designed to be nutrients of closed-loop and regenerative systems.