The concept of a circular economy (CE), as a tool that offers solutions to some of the critical global challenges of sustainable development, is gaining prominence in academic study and practical application. The concept is frequently understood as a pathway to reach sustainable consumption and production patterns while tackling with decreasing natural resources. In order to encourage changes in purchasing habits and product usage, such a transformation necessitates not only a significant shift in industrial production but also customer and user participation. The textile industry has often been the focus of circular economy and circular design research, due to the industry's use of natural resources, the damage it causes to the environment during production, and the increase in consumption brought by the fast fashion trend. Yet, there is currently a lack of information regarding its connections to consumption and disposal from the perspective of consumers. Every year, tons of textile waste are incinerated or landfilled around the world. The purpose of this study is to explore and assess the user experience of several platforms from Istanbul that serve as intermediaries to reuse fashion products in the system after they have been discarded by consumers. The research uses the netnography method to investigate the frequently used intermediary platforms, which facilitate the purchase, recycling, and donation of second- hand clothing in Istanbul, and maps their users by developing personas. The article further focuses on donation behavior through semi-structured interviews and investigates factors influencing users’ donation behavior by employing planned behavior theory. The study reveals aspects that users consider when deciding whether or not to discard clothing products, as well as internal and external barriers and motivations that affect donation behavior. The results of the research aim to contribute to the theory by presenting empirical data on the motivations of Turkish consumers' donation behavior and to practice by exemplifying possible user experience improvement areas related to facilitating platforms.