PurposeThe purpose of this research is to develop a multidimensional measurement of fashion domain entrepreneurial self-efficacy (FDESE) based on which fashion entrepreneurs will be able to better develop strategies to gain and sustain success in their business development. The research is crucial to advocate fashion entrepreneurship and will provide direction for fashion business incubation services.Design/methodology/approachThis research included three stages with mixed qualitative and quantitative approaches: conceptualizing construct definition and specifying domain(s) to generate initial items, scale purification and scale validation. This study started with reviewing the literature and individual interviews among 19 fashion entrepreneurs, which generated 72 initial items. An online survey was then conducted with individuals who are running or have the intention to run fashion businesses, yielding 249 useable samples for scale purification, which generated 21 items for the validation phase. Lastly, another online survey was administered to individuals who are currently running fashion businesses which resulted in 258 valid responses included for scale validation.FindingsA measure of FDESE that is both reliable and valid was developed, including 21 items across four distinct dimensions: passion for fashion business (five items), marketing and branding (seven items), financial management (five items) and creativity (four items).Originality/valueThis study is the first attempt to develop practical scales measuring self-efficacy that focus on fashion domain entrepreneurship. The newly developed FDESE scale indicates that entrepreneurship not only involves marketing skills, financial knowledge, creativity, leadership, and proactivity but also requires passion and persistence.