This paper builds on a body of multi-disciplinary literature to analyze and compare the emergence of the prêt-à-porter industry in France and the ready-to-wear industry in Italy from their founding to their growth stages in the mid-twentieth century. The comparison demonstrates the significant impact that the French Chambre Syndicale de la Couture, des Confectionneurs et des Tailleurs pour Dame, and the National Chamber of Italian Fashion had on the trajectories of the fashion industry for each country. The article focuses on foundational entrepreneurs within the industry such as Giovanni Battista Giorgini, Jean Patou, Coco Chanel, Christian Dior, and others. It analyzes how these chambers supported the emergence of differentiated firms within the fashion industry, and how the industry responded to the business conditions in the international economy of the post-World War II period through the global recession of the 1970s.