In 1913, Mary P. Jacob revolutionized women's fashion by inventing the modern brassiere. At a time when restrictive corsets were standard, Jacob's design, crafted from silk handkerchiefs and ribbons, offered women a more comfortable and natural-fitting alternative. Patented under the name Caresse Crosby, her innovation gradually gained popularity, enhancing personal comfort and influencing the evolution of garment design. Jacob's contribution laid the foundation for contemporary undergarment technology.