The soft manikin system, which includes a manikin made of soft silicone and a body movement simulator, mimics the dynamic movements of the soft tissues of human breasts during various activities such as walking and running. Contrary to traditional human wear trials, this low-cost system obtains information for objective evaluation of bra performance in motion, providing a reliable basis for pressure and support assessments. The system covers a range of breast sizes using interchangeable breast parts. It helps bra designers to identify the most suitable design features and materials for optimal breast support and wearing comfort.