The Fast Fashion industry, which operates on a take-make-waste model, has a significant environmental impact due to its high-water consumption, use of chemical substances, and waste production. Consequently, textiles and clothing waste have become a major global concern. In response, the Circular Economy model has garnered considerable attention worldwide, with theEuropean Union showing notable progress in transitioning towards this sustainable approach. New regulations are creating an enabling framework for the circular economy to thrive and for better waste management. This transition necessitates substantial changes in both legal and business practices. The present study aims to analyse EU measures that influence the development of sustainable practices and the shift to a circular economy in the Fast Fashion industry. It employs a legal analysis and a business case study to identify and evaluate the laws implemented by the EU and the strategies used by Fast Fashion companies to adapt their waste management practices to the circular economy.