Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
designer [dɪˈzaɪnər] n (ART) диза́йнер; (of program) разрабо́тчик; (of building) проектиро́вщик; (of machine) констру́ктор; (also: fashion designer) моделье́р
adj (clothes) моде́льный
designer label фи́рменный знак моделье́ра
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.