The development of the fashion industry, while providing significant impact to the economy, also has negative environmental and social consequences. Thus, many countries, including Indonesia, require the fashion industry to adopt sustainable supply chain management. To ensure the success of their implementation, it is necessary to determine the key indicators that might influence the implementation of a sustainable supply chain, especially in the context of the Indonesian fashion industry. This study aims to determine key performance indicators (KPIs) in implementing sustainable supply chain management for the Indonesian fashion industry. This study utilised a Decision-Making Trial and Evaluation Laboratory based Analytical Network Process (DEMATEL-based ANP) method to analyse and prioritise the indicators for three sustainability dimensions. This study reveals several variables for assessing the sustainable supply chain performance, which include operating costs, customer satisfaction, environmental compliance, implementation of environmentally friendly technology, and education and training. The outcomes of this study could be further used by the fashion industry to assess current performance and discover opportunities to improve its positive impact on society. © 2025 The Authors