The application of ergonomics in the field of clothing design is becoming increasingly important. This paper focuses on the bust dart technique in women's clothing pattern making, combining ergonomic principles to analyze its anatomical basis, technical classification, and application scenarios. It explores the dynamic comfort evaluation indicators of bust dart design from an ergonomic perspective and its functional optimization and technological innovation in well-fitting clothing design. Through literature review, experiments, and case analysis, this study explores the dynamic comfort evaluation criteria for bust dart design and its functional optimization and technological innovation in fitted garment design. The research finds, that reasonably allocating bust dart volume and optimizing process treatment can significantly enhance the garment's fit and movement adaptability. Additionally, intelligent pattern-making technology can precisely match female body characteristics, achieving personalized and intelligent garment design. Future research should further deepen interdisciplinary collaboration, explore the application potential of adjustable bust dart structures, and promote the continuous innovation and improvement of women's apparel structural pattern-making technology.