This study explores the expressive characteristics of new media fashion collections, which have emerged through the convergence of fashion and digital technologies. As new media develops with the integration of old media, fashion collections are increasingly functioning as media tools to convey identity, narrative, and artistic intent beyond aesthetic presentation. Through a literature review and case analysis of collections from 2000 S/S to 2025 S/S, this study defines the term ‘new media fashion collection’ and investigates its communicative functions. The findings reveal that such collections embody the significance of the expansion of space-time, evolution of expression methods, and decentralization of experience, while diversifying meanings and modes of expression based on new media attributes such as extensibility, integrativeness, and interactivity. More specifically, their expressive characteristics can be understood through four characteristics: the direct representation through borrowing, the diversity of message expression, the immersion through unreality, and the narrative construction via editing. Collectively, these characteristics demonstrate how new media fashion collections emphasize themes by using digital technology to borrow or transform old media content. Digital technologies allow fashion collections to unfold across limitless space-time dimensions, positioning them as versatile communication media and enhancing expressive possibilities. These approaches reflect how fashion collections in the digital era integrate technological elements to enrich communication and viewer engagement. This research contributes to the positioning of fashion collections as a form of media and offers a framework for analyzing their evolving expressions. Further, it highlights the need for continued interdisciplinary research bridging fashion, technology, and media theory.