Hatmaking is the manufacture of hats and head-wear. Millinery is the designing and manufacture of hats. A millinery shop is a store that sells those goods.
A milliner or hatter designs, makes, trims, or sells hats.
Millinery is sold to women, men and children, though some definitions limit the term to women's hats. Historically, milliners, typically female shopkeepers, produced or imported an inventory of garments for men, women, and children, including hats, shirts, cloaks, shifts, caps, neckerchiefs, and undergarments, and sold these garments in their millinery shop.
More recently, the term milliner has evolved to describe a person who designs, makes, sells or trims hats primarily for a female clientele.
The origin of the term is probably the Middle English milener, meaning an inhabitant of the city of Milan or one who deals in items from Milan, known for its fashion and clothing.
Many styles of headgear have been popular through history and worn for different functions and events. They can be part of uniforms or worn to indicate social status. Styles include the top hat, hats worn as part of military uniforms, cowboy hat, and cocktail hat.
This is a partial list of people who have had a significant influence on hatmaking and millinery.