Millinery refers to the craft and trade of designing, making, and selling hats, particularly women's hats. The term is derived from the Italian city of Milan, which was historically known for its fashionable hat-making. Milliners create a variety of headwear, often using materials like fabric, straw, and feathers, and may also embellish hats with decorative elements. The profession has seen fluctuations in popularity, but it remains an important aspect of fashion and formal attire today.