The primary function of a brassiere is to support and stabilize the breasts during daily activities and physical movement. It helps distribute breast weight more evenly across the chest wall and shoulders, reducing strain on ligaments and muscles—particularly the Cooper’s ligaments—which lack elasticity and can stretch over time without adequate support. A well-fitted brassiere also enhances posture by encouraging proper spinal alignment, minimizes discomfort associated with breast motion—especially during exercise—and contributes to overall physical confidence and comfort in clothing. While aesthetic considerations such as shaping or modesty may influence design choices, structural support remains the fundamental purpose rooted in anatomical and physiological necessity.