This monograph analyses and systematizes how XR technologies are transforming the design of shopping experiences in the fashion industry. It offers a methodological, technical, and evaluative approach to designing and analyzing new immersive shopping environments. Chapter 1 contextualizes the emergence of XR within the broader process of digital transformation in fashion. Chapter 2 reconstructs the historical evolution of these technologies, from their initial experimental stages to their current integration into commercial platforms. Chapters 3 and 4 introduce offline and online shopping domains, respectively, and highlight how XR fits into both. Chapter 5 then proposes an interdisciplinary theoretical framework connecting design, technology, and consumer behavior, laying the foundations for an integrated design approach. Chapter 6 illustrates how XR applications differ in relation to product categories—clothing, accessories, and footwear—and their respective experiential requirements. Chapter 7 explores the technological foundations of immersive shopping, analyzing the software, hardware, and interaction systems that enable XR experiences. Chapter 8 identifies UI design as a determining factor for usability, engagement, and brand communication consistency. Chapter 9 examines the role of virtual embodiment and autonomous virtual agents in fashion shopping experiences. Chapter 10 presents a model for evaluating XR experiences, based on the interaction between external stimuli and the user’s psychological states. In conclusion, the monograph interprets XR fashion retail as a complex ecosystem of cultural, technological, social, environmental, and psychological interactions, discussing the contribution of cultural studies, the impact of XR on sustainability and inclusion, and offering concluding guidelines for the design of immersive and responsible shopping experiences.