The purpose of this paper is to investigate how suppliers in Bangladesh garment industry independently can take CSR for their own business affairs. Data is collected through interviews of large international buyers, important Bangladesh suppliers and major organizations having influence on the supply chain context. The findings show high supplier dependency on buying company’s code of conduct in CSR implementation. Five main challenges are identified; weak supplier-driven CSR implementation; non-questioning business culture; dilemma consequences of order pressures; weak coherence between the buyers’ implementation strategies and; absence of self-contained supporting organizational structure. This research considers CSR implementation as prerequisite for ensuring efficiency and sustainability in the supply chain of the garment industry in Bangladesh. Based on the challenges it is suggested that suppliers need to improve by: (1) initiatives and measures to build up responsibility to practice CSR; (2) develop a supply chain culture based on CSR orientation and intelligence and (3) establish link with educational institutions to achieve CSR competence for implementation. The study offers insight on CSR implementation challenges of international suppliers of Bangladesh garments industry and highlights the understanding of the effects of CSR implementation for supply chain sustainability.