Mass production and global trade have fuelled apparel industry economic growth since the industrial revolution. Mass production and global trade have also contributed to sustainability issues, such as pollution and resource depletion. This scoping review explores how garment sizing and fit affect the sustainability of the Malaysian garment industry. The research objective was achieved using an in-depth analysis of the literature to identify the main sizing and fit issues and research gaps in the Malaysian apparel industry. Furthermore, the sustainability challenges resulting from sizing and fit issues were explored and the strategies to address these issues for apparel industry sustainability were proposed. Finally, the authors suggest that Malaysia should establish its own standard sizing system to contribute to the sustainable development of the local industry. This comprehensive analysis aims to provide an empirical basis and strategic guide for sustainable development by the Malaysian apparel industry.