This study examines the factors that influence the maturity of ecodesign practices in the fashion industry, focusing on how organizational strategies and the adoption of environmental Key Performance Indicators (KPIs) contribute to this process. It includes a re-elaboration of existing theoretical models, linking ecodesign maturity levels and KPIs to organizational practices and various dimensions of ecodesign. Data was collected from companies of the SDA Bocconi Monitor for Circular Fashion. The findings show that companies with dedicated ecodesign teams achieve higher maturity levels, as these teams better integrate sustainability principles into operations. KPIs are also strongly linked to maturity, highlighting the importance of systematic measurement and monitoring in improving sustainable practices. Other strategies, such as training, internal collaboration, and the involvement of external consultants may have an effect depending on the maturity level or their combination with other actions.