Unfortunately, as an AI model, I do not have access to real-time information or the ability to browse the internet. Thus, I cannot provide rankings or information about the top 10 sustainable fashion brands in 2023. However, some of the popular sustainable fashion brands in earlier years (such as 2021 or 2022) were Stella McCartney, Reformation, Patagonia, Eileen Fisher, Everlane, Veja, Pact, and Amour Vert. It is worth noting that the fashion industry is constantly evolving, and new brands with sustainable practices may emerge in the coming years. It would be best to refer to recent publications or fashion industry reports for the most up-to-date information on the top sustainable fashion brands in 2023.