This Doctor Who screencap contains
costume d'affaires and costume d’affaires.
There might also be
bien habillé personne, costume, costume pantalon, tailleur-pantalon, pantalon costume, pantsuit, personne bien habillé, and pantalon de costume.
Video of Orbital remixing the Doctor Who theme musique (circa 1986) at the Glastonbury musique festival in 2004 (before the new series began, needless to say).