The costumer can take on a multitude of roles which can vary greatly depending on the film, weather, and shooting location . The costume design assistants, buyers and costume supervisors work closely with the costumer designer to establish the appropriate style, fabrication and elements of a costume to resemble a particular time period, era, or concept of a film.
Key costumers such as background coordinator, set supervisors and truck supervisor work with the costumes during shooting to store, organize, wash, touch up, and assist actors with their costumes from the trailers to the set.

Set costumers focus on helping the cast or background performers with dressing and costume maintenance, final looks and the delivery and transportation of costumes from the office/truck to set and back to the truck or the costume offices.