cou·tu·rier 
(k-trē-ər, -ē-ā′, -tür-yā)
(k-trē-ər, -ē-ā′, -tür-yā)n.
1. An establishment engaged in couture.
2. One who designs for or owns such an establishment.
[French, dressmaker, from Old French cousturier, from cousture, sewing; see COUTURE.]