The rising concerns for environmental and social responsibility of fashion industry have led many companies to implement sustainable practices throughout their supply chain. The main objective of the study was to explore sustainability practices through supply chain assessment of India's largest denim manufacturer and exporter, Arvind Mills. Sustainable fashion supply chain includes eco- friendly raw materials and preparation, sustainable manufacturing, green distribution channels, green retailing, and ethical consumers. An effective sustainable fashion supply chain helps companies to enhance brand image and gain more consumer support. Qualitative data was collected through one on one interviews with company personals in different units such as manufacturing, product design, product development, marketing, sourcing and human resource. Secondary data was collected through company's website, annual sustainability reports etc. The study revealed that Arvind Mills sustainable practices and performance were remarkable and can be grouped under six categories- Cotton, Water, Chemicals, Energy, People and Money.