Design a relational database system for a large costume rental store. The store has approximately 3,200 customers each year. It is stocked with over 500 costumes in various sizes. The rental costumes and other items that may be purchased by the customer (e.g., make-up and teeth) are purchased from approximately thirty-five different suppliers. Design the necessary database files.

Make sure they are in third normal form, and indicate the necessary linkages.