Milliners were often women, and they typically worked from their own homes. They would take measurements of their customers' heads and then create custom-made hats. Milliners also sold ready-made hats, and they would often display their wares in their shop windows.
Millinery was a popular trade in Colonial America, and milliners were often able to make a good living. However, the trade declined in the 19th century as ready-made hats became more affordable.