/ kɒsˈtjuːmiə(r); NAmE kɑːsˈtuːmieɪ/ ( BrE ) ( NAmE ˈcos·tu·mer ) noun
a person or company that makes costumes or has costumes to hire, especially for the theatre :
a firm of theatrical costumiers
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WORD ORIGIN
mid 19th cent.: French , from costumer dress in a costume, from Italian costume custom, fashion, habit, from Latin consuetudo , from consuetus , past participle of consuescere accustom, from con- (expressing intensive force) + suescere become accustomed.