Smart textiles have established a foothold in different academic fields, such as in chemistry, engineering, and in human-computer interaction (HCI). Within HCI, smart textiles are present in research in many ways, for example, as context, as means, or as focus. However, interdisciplinary projects tend to leave the implications of and to textile design without notice. How can a project utilise a textile designer’s skills to feed back to textile design from an interdisciplinary project? In this paper, we present a case study, where a textile designer’s role extends beyond the prototype production, and we analyse the project in light of textile design. Our findings show that textile design can augment data collection and analysis. We conclude with a discussion towards inclusion of textile design in HCI.