Background: The increased attention to the subject of sustainable development within the fashion industry is frequently explained by how the fashion industry has become global, connecting brands, producers, manufacturers, businesses, and consumers across the entire globe. This has further led to the need for new constellations of global multi stakeholder collaborations. In 2009, a rather remarkable collaboration was announced; Patagonia and Walmart are pairing up to fight for a sustainable apparel, footwear, and textile industry. The collaboration is called The Sustainable Apparel Coalition (SAC) and is today representing nearly half of the entire volume of global production for apparel and footwear. Purpose: The purpose of this research is to identify key decision points and actions in the development of SAC and the Higg Index. The aim is to understand how to create a foundation for sustainable development within the fashion, apparel and textile industry on a global scale. Methodology: The research has been conducted through an exploratory case study of qualitative character, focusing on the development process of SAC and the Higg Index. The data has been collected through in-depth interviews with participants having prior knowledge, insight, participation, and experience of the development process of SAC and the Higg Index. Further the data has been analyzed through an inductive thematic analysis. Result & Analysis: Several interesting themes arrived in the result. However, these were narrowed down to four key factors for the development process of SAC and the Higg Index; Industry collaboration through democratic organizational culture, Getting the right people on the bus, then teaching them how to drive it, Trustworthy standards, communication and transparency throughout the supply chain, and Striving for global sustainable development = good for business. Research Limitations & Suggestions for Future Research: Due to the exploratory character of the study, conclusions have been drawn with caution and has rather aimed to focus on the contribution of new insights, a deeper understanding and increased knowledge of the development of SAC and the Higg Index. The main suggestion for future research is to conduct a study which includes the perspective of the manufacturers and workers within the supply chain. This type of study could assist with gaining further insights of obstacles and potential solutions for how to globally adopt the Higg Index within all levels of the supply chain in the most successful way.