A hat in a dream is a symbol of knowledge. If you dream that you are putting on a hat, your dream could mean that you are gaining new information.
Changing from one hat to another in a dream can mean that you are changing the way you think about things.
A hat can represent authority, so if you dream that you are wearing a hat, you could desire more authority. You may feel that others have too much control over your life.
If you dream that you are among a group of people and you are the only one wearing a hat, you may feel that you don’t fit in with others.
A dream that you are the only person not wearing a hat, or that you have lost your hat, can mean that you feel that information is being withheld from you.