This chapter explores the technological foundations of immersive shopping in the fashion industry, analyzing the software, hardware, and interaction systems that enable XR experiences. Drawing on an extensive body of empirical studies, it categorizes tools and frameworks used to develop XR applications—ranging from 3D modeling software and game engines (e.g., Unity, Unreal Engine) to AI-driven personalization systems and cloud platforms. The chapter also reviews the role of output devices, from mobile screens and virtual mirrors to immersive VR headsets, highlighting how display quality and device type influence realism, usability, and presence. A detailed examination of input methods—including gesture control, eye and head tracking, motion capture, and voice interfaces—reveals how interaction technologies shape consumer engagement and emotional response. By synthesizing this diverse ecosystem, the chapter identifies critical design principles for building intuitive, accessible, and brand-consistent XR shopping environments. It also outlines key challenges, such as technological fragmentation and usability barriers, and provides recommendations for future research, including the development of multimodal interfaces and standardization efforts. Ultimately, this chapter positions software and hardware not as neutral tools, but as active agents in crafting meaningful, immersive fashion experiences.