PurposeThis article aims to analyze the way the leader acts in the development of collective competencies (CC) of fashion work teams, seeking to demonstrate ways in which the leader can collaborate for the development of the collective work.Design/methodology/approachWith a qualitative approach, this paper carried out a case study strategy having the Creation Center of a fashion group from Santa Catarina, Brazil as a research object. Data collection took place through semi-structured interviews and participant observation with 36 employees from 6 work teams from 5 clothing brands.FindingsOur findings make it clear that the leader influences the CC development of fashion work teams. The leader's role becomes essential for directing and developing his team, seeking to encourage participation and cooperation between team members to achieve the objectives and expected results. It was considered that the CC development could be associated with how much the leader represents his team and contributes with guidelines that emphasize the collective and the people and teams' development. The leader who makes the cooperative relationship feasible, encourages effort and promotes cohesion and teamwork tends to collaborate with actions that foster CC development.Originality/valueFrom a theoretical perspective, it is the first study to analyze empirically the relationship between leadership and CC. A model with 18 guidelines was developed, divided into six determining factors (activity dynamics, team composition, individual characteristics and dispositions, team integration, communication and physical structure) that demonstrated the way the leader collaborates for the CC development. For the fashion industry, this study demonstrates elements capable of assisting collective creativity and the development of fashion collections.