This book presents an advanced methodology for developing tightly fitting clothing using automated 4D scan data analysis and individualized, deformable human body Finite Element models (ID-HBM). It introduces generalized methods for automatic 4D scan data processing, enabling body deformation and clothing-body interaction analysis. By leveraging 4D scan data, it enhances the comparability of static and dynamic movements, facilitating the creation of both static and dynamic ID-HBM-clothing FE models. These approaches are applied to study breast-bra interactions, comparing different bras on test subjects. The book also develops and validates static and dynamic FEM models for breast-bra interaction, assessing variations in bra fit, pressure distribution, and dynamic behavior through pressure measurements and 4D scan data analysis.