This Nathan Fillion photo contains
costume d'affaires and costume d’affaires.
There might also be
costume, costume de vêtements, bien habillé personne, costume, costume pantalon, tailleur-pantalon, pantalon costume, pantsuit, personne bien habillé, pantalon de costume, and costume trois pièces.
Just found on YouTube and I never realised he was in this film! Really got to watch the whole thing one of these days, have only ever seen bits and pieces.