You searched for: “costumer
customer, costumer
costumer (KOS too" muhr, KOS tyoo" muhr) (noun)
An individual who makes, buys, or sells the clothing used by actors, etc. for dressing differently for special occasions: The performers went to the costumer to get the right outfits for their parts in the new play.
customer (KUS tuh muhr) (noun)
An individual who buys a service or item: Meghan was a good customer at the store because she was always purchasing her books from them.

As a customer, Santiago went to the shop to talk with the costumer about the costumes which he wanted for the costume party.