Research on Pattern Structure Optimization of Trousers Back Pants Piece Based on Ergonomics

As modern garment design continuously raises requirements for comfort and aesthetics, structural design plays an increasingly important role in enhancing the wearing experience of garments. This paper takes women's trousers as the research object, focusing on the optimization design of the back pants piece pattern structure, aiming to improve the pulling sensation during dynamic movements such as squatting, leg lifting, and bending, thereby enhancing wearing comfort and freedom of movement. Based on the difference between the body's hip circumference (H) and waist circumference (W), the paper systematically analyzes the design methods for key structural parameters of the back pants piece, including: waist rise amount, back crotch seam inset, crotch line position, blocking and stretching section treatment, and dart adjustment. Combined with a specific size (170/94A) for example calculation and analysis, the influence mechanism of each parameter on the amount of activity is verified. Research indicates that by reasonably setting parameters such as the rise amount as (H-W)/5, the inset amount as (H-W)/6, and the crotch line distance as 8cm+(1.2H/100)cm, the activity allowance above the hip line can be effectively increased, significantly alleviating the binding sensation during dynamic movements. Furthermore, this paper also explores the application of blocking and stretching techniques in the back pants piece. Through the coordinated processing of stretching and gathering, the pants piece conforms better to the curves of the human body, balancing aesthetics and function. The research results provide a theoretical basis and practical reference for the structural design of functional women's wear.