Okay kiddo, so a coal scuttle bonnet is a type of hat that was worn by women in the late 1800s and early 1900s. It was named after a coal scuttle, which is a container used for carrying coal.
The hat has a wide brim that goes all the way around and is usually made of straw or felt. It also has a deep crown that kind of looks like an upside-down shallow bucket. The crown of the hat was often decorated with ribbons, flowers, or feathers.
The reason it was called a coal scuttle bonnet is because the shape of the hat kind of looks like a coal scuttle, which was a very common item in people's homes back then. Plus, the hat was sometimes used to protect women's faces from the coal dust that was often around.
Nowadays, people don't wear coal scuttle bonnets very often, but they're still popular as props in historical movies and plays. So there you have it, kiddo!