Regalia is like a special outfit for important people. It's like a costume that shows everyone that you have an important job or role.
For example, when a king or queen is crowned, they wear regalia like a crown, a special robe, and maybe even a scepter. This shows everyone that they are the ruler and in charge.
Similarly, when someone graduates from college or university, they wear special regalia like a gown, a cap, and sometimes even a hood. This shows everyone that they worked hard and achieved a big accomplishment.
Overall, regalia is a way to show off someone's importance or achievements through special clothing or items.