This study proposes a comprehensive performance scorecard for sustainable ergonomics assessment of textile-based organizations, contributing to socially sustainable global supply chain practices. The framework integrates sustainability and ergonomics principles, considering economic, social, and environmental dimensions equally. A systematic literature review was conducted to extract sustainability indicators, which were then adopted as ergonomics indicators (EIs). The weights of the 20 newly proposed EIs were determined using subjective (expert opinions) and objective (entropy) methods. Data was collected from 23 textile-based organizations using a performance scorecard sheet, and the Grey Relational Analysis (GRA) method was employed for normalization and aggregation of the EIs scores. A performance benchmarking tool was constructed to classify the sustainable ergonomic performance of the participating organizations. The proposed EIs were mapped to the United Nations Sustainable Development Goals (SDGs) and targets using a Sankey diagram, highlighting their contributions to the sustainability agenda 2030. The empirical study revealed that 73.91% of the participating organizations were average performers, while 13.04% were developing performers, indicating the need for improvement in sustainable ergonomic practices. The proposed framework provides a viable tool for decision-makers to assess and benchmark the performance of supplier organizations, promoting transparent and consistent socially sustainable supply chain practices.