Abstract:

Objective In order to solve the problem of insufficient fit of men's trousers with protruding abdomen, a method for optimizing the trousers patterns for this group of men is proposed with the purpose of optimizing the structure of men's pants and improving the fit and comfort of the trousers based on three-dimensional fitting technology. Parametric modeling of men's trousers patterns with CLO-3D technology for men with protruding abdomen was carried out. This parameter optimization design provides useful reference for the structural design of men's trousers with special body type in the production process.

Method CLO-3D was used to construct seven virtual models with different waist sizes for men, and the regression analysis of waist circumference and critical circumference of lower limbs of men with abdominal obesity was carried out through model body surface standing cut and paper pattern fitting, and the method was verified through the virtual try-on experiments and real-life try-on experiments.

Results By constructing a model with a protruding belly and performing surface draping and pattern fitting, it was observed that the contours of the front and back pieces change proportionally as the degree of the belly protrusion increases. Specifically, the front center point, back center point, and the circumference change at one-third of the front crotch depth (belly allowance) showed significant and balanced variations in circumference. The side waist points exhibited noticeable and proportional changes in height, while both the front and back center points displayed clear proportional changes in both circumference and height. Treating the front waist measurement as a dependent variable and the back waist measurement as an independent variable, the regression coefficient for the back waist measurement was solved, revealing a distribution ratio of 5∶4 between the front and back waist measurements. Using the hip measurement as the independent variable and six key adjustment parameters and four key structural parameters as dependent variables, regression analysis showed a significant linear relationship between these parameters and the hip measurement, with a high degree of fit for the regression model. Based on this, a total of six key regulating parameters and six key structural parameters were derived as the rules for the variation. Considering the characteristics of men's trousers structural design, the regression equations were appropriately simplified to derive optimization rules for men's suit trousers tailored to protruding bellies. Using CLO-3D software for virtual fitting of the optimized trouser patterns, the results indicated that the stress area on the front waist and abdomen, as well as the front hip, was reduced, with pressure values approaching 0 kPa, resulting in reduced pressure sensation and improved comfort. Static and dynamic fitting trials on real individuals with protruding bellies showed high evaluations from participants regarding comfort and aesthetics.

Conclusion To address the issue of poor adaptability of men's suit trousers for individuals with protruding bellies, this study utilized three-dimensional virtual fitting technology to construct a model of a male with a severe protruding belly. Surface draping was employed to obtain the model's surface data, and through the analysis of two-dimensional pattern fitting, parametric optimization rules for men's suit trousers tailored to severe protruding bellies were established. The accuracy and feasibility of these optimization rules were verified through virtual fitting experiments and real-life fitting trials. The research content and results hold significant implications for shortening product production cycles, reducing energy consumption, and improving the accuracy and fit of pattern adjustments for suit trousers designed for individuals with protruding bellies.

Key words: protruding abdomen, special body type, trousers structure, 3-D virtual fitting, pattern optimization, garment pattern making