This article endeavors to examine the application of fiber composite materials within stage costumes and their critical role in elevating the quality of theatrical performances while nurturing innovation in costume design.It meticulously analyzes the properties,design,and manufacturing processes of fiber composite materials,and through practical case studies,it explores how these materials can meet the requirements for lightweight construction and strength optimization in theatrical attire.Cutting-edge fiber composite materials,such as carbon fiber,fiberglass,and aramid fiber,due to their remarkable characteristics,can significantly enhance the durability of stage costumes while minimizing their weight,thereby augmenting the comfort and agility of performers.