The growing emphasis on sustainability within the global apparel industry has accelerated the adoption of green marketing and circular fashion practices, particularly in export-oriented manufacturing sectors such as Bangladesh’s ready-made garments (RMG) industry. Despite increasing attention to sustainable production and circular economy initiatives, the role of merchandisers in facilitating these transformations remains underexplored. This study employs an Integrative Literature Review (ILR) approach to examine how merchandisers contribute to the alignment of green marketing strategies and circular fashion practices within Bangladesh’s RMG sector. A structured literature search was conducted using major academic databases and institutional sources, and a PRISMA-inspired screening process was applied to identify and evaluate 51 relevant studies and industry reports. The findings reveal that merchandisers function as critical sustainability intermediaries by coordinating sustainable sourcing, ensuring compliance with environmental standards, facilitating stakeholder communication, and supporting the implementation of circular business practices. However, their effectiveness is constrained by challenges including limited technical expertise, cost pressures, inconsistent buyer requirements, and inadequate recycling infrastructure. The study further highlights the importance of stakeholder collaboration, institutional support, and capacity-building initiatives in strengthening sustainability integration across apparel supply chains. By conceptualizing merchandisers as key agents of sustainability implementation, this research contributes to the growing literature on sustainable apparel production and provides practical and policy-relevant insights for advancing green marketing and circular fashion within Bangladesh’s RMG industry.