A couturier is a professional who specializes in the design, creation, and fitting of high-end clothing. They are also known as dressmakers, modistes, or designers. Dressmakers create custom-made garments for individual clients, while modistes are experts in the art of millinery, or hat-making. Designers create original clothing designs for fashion houses and other companies. All three terms refer to the same profession, which requires a high level of skill and expertise.