The athleisure market has experienced significant growth in recent years, establishing itself as a mainstream trend in the fashion industry. Given the escalating demand for athleisure wear, businesses must secure sustainable growth by comprehending customer intentions to repurchase. This study conducted a survey to collect customer data in order to study customers’ intentions to repurchase athleisure wear. Additionally, survey questions were developed through a literature review and incorporated into the survey. To determine the suitable sample size for the analysis while considering statistical significance, the study took into account the current total population of South Korea, a confidence level of 95%, and a margin of error of 5%. This calculation determined that a sample size of 400 in this study was well-suited to the data analysis. In a study investigating customer intentions to repurchase athleisure wear, several influential factors were identified. Firstly, the purpose of product use (motivation for wearing) and functionality emerged as critical determinants affecting customer intentions to repurchase. Customers who perceived a clear purpose of use and functional excellence were more inclined to repurchase, underscoring the paramount importance of designing athleisure products with a strong focus on functionality. Nevertheless, it was observed that male and female customers exhibited distinctive levels of satisfaction with the product. Male customers placed greater emphasis on the product’s essential attributes, whereas female customers highlighted the importance of how athleisure wear fits into their everyday lives and its aesthetics. This divergence indicates that male and female customers possess varying preferences when it comes to product attributes. Consequently, it is imperative to devise tailored marketing strategies that align with the distinct priorities and interests of male and female consumers during the sale of athleisure wear products. In summary, this study underscores the significance of comprehending customer behavior and intentions to repurchase within the athleisure market. By prioritizing the articulation of the product’s purpose and enhancing its functionality, businesses operating in the athleisure sector can secure enduring growth and success.