This study employs deconstructionist theory as its theoretical foundation to investigate the structural evolution and mechanisms of aesthetic expression in the shoulder forms of contemporary women’s wear. The research first analyzes the reasons for the failure of traditional shoulder structures in the trend towards loose silhouettes, arguing that conventional principles—such as fixed shoulder slope angles and rigid front/back chest width distribution—struggle to adapt to the volume expansion and dynamic posture requirements of modern clothing, leading to structural imbalance and design deviations. Subsequently, through shoulder structure disassembly experiments and digital simulations, it systematically verifies key factors such as shoulder line offset, redistribution of ease, and reconstruction of sleeve cap curves, revealing the logic behind the transformation of the shoulder from a “stable structure” to a “dynamic structure.” The study finds that design features such as shoulder offset, forward inclination, drooping, and dislocation are not merely stylistic treatments but natural outcomes of changing structural relationships, which further evolve into new aesthetic symbols under deconstructionism. Based on these findings, the research proposes a “Deconstructionist Shoulder Form Generation Model” to illustrate how the shoulder acquires new expressive meaning within contemporary aesthetic and body culture contexts. This study provides both a theoretical basis and structural methodologies for innovation in women’s wear shoulder design, offering practical value for loose silhouette and deconstructionist design.