Hats are different in different parts of the world. Some hats are worn by women, other hats by men, others by both; infants and children may also wear hats, and some hats are not worn by anyone at all. These hats are just used for decoration. People who make hats for men are called hatters, and those who make hats for women are called milliners. The kinds of hats (or caps, which are like hats) worn by different groups within various societies in different countries are very numerous. 