A costume designer is a professional responsible for creating the clothing and accessories worn by characters in film, theater, and television. They work closely with directors and production teams to ensure that the costumes reflect the story, setting, and personalities of the characters. This involves researching historical styles, selecting fabrics, and sometimes even creating custom pieces. In addition to designing, costume designers often oversee the fitting and alterations of costumes to ensure they fit the actors properly. They may also manage a team of assistants and collaborate with other departments, such as makeup artists and set designers, to create a cohesive visual experience.