In 2013, the Rana Plaza disaster highlighted the highly exploitative conditions of the global garment supply chain centred on Bangladesh. Global lead firms and other stakeholders responded by reforming the labour governance system comprising public and private regulations. How can the effects of this new multi-level governance system on worker outcomes (wages, working conditions and workers’ rights) be conceptualized and explained? Using an inter-disciplinary framework integrating an industrial relations/sociology perspective and a global production network approach, we show how workplace relations (structural and relational workplace characteristics) mediate the relationship between the labour governance system and worker outcomes. A mixed methods research design that includes a factory management survey and case studies enables us to identify and analyse two predominant types of workplace labour regimes associated with different patterns of worker outcomes (procedural and substantive employment conditions). Referred to as the hardship and sweatshop regimes, respectively, these differ in the extent to which workers are exploited. With the emergence of the Covid-19 pandemic, we discuss the possibility that modern slavery, the worst form of worker exploitation, is emerging. The paper concludes by briefly considering several research and practical implications of our analysis.