Green supply chain management practices are gaining enormous attention from academics and practitioners. The global strategy to reduce the negative effect on the environment reinforces manufacturing industries to practice Green Supply Chain Management (GSCM) in their operations. This paper aimsto investigate the effect of GSCM practices on environmental performance. It futher examines the mediating effect of GSCM practices in the relationship between green strategy, environmental management, green procurement, and environmental performance. In addition, this study assesses the role of procurement ethics in GSCM practices and environmental performance. A structured questionnaire with a five-point Likert scale was used to gather data from the textile garments sector in Bangladesh. The PLS-SEM technique was adopted to analyze 238 survey data. The findings demonstrate the significant direct and indirect effects of GSCM practices on environmental performance. Further, procurement ethics determine the level of relationship between GSCM practices and environmental performance. The results add to the existing pool of knowledge relevant to GSCM practices and environmental performance, particularly concerning the mediating role played by GSCM practices. Besides, procurement ethics supplement the effect of GSCM on environmental performance, which significantly contributes to the literature. Believably, the findings will facilitate the manufacturing industry and can be used as a strategic instrument for adopting GSCM practices.