de rigueur

following the established traditions of refined society and good taste though he was wearing a dinner jacket and a black bow tie, his jeans and tennis shoes were hardly de rigueur Synonyms befitting, correct, decent, decorous, proper, genteel, nice, polite, respectable, seemlyRelated Words acceptable, adequate, satisfactory, tolerable; dress, dressy, formal; dignified, elegant, gracious; priggish, prim, stiff, stuffy; apt, material, relevant; compatible, congenial, harmonious; allowed, authorized, kosher, permittedNear Antonyms intolerable, unacceptable, unsatisfactory; casual, grungy, informal; seedy, shabby, tacky; banned, barred, disallowed; forbidden, interdicted, outlawed, prohibited, proscribed; awkward, gauche, ungracefulAntonyms improper, inappropriate, incorrect, indecent, indecorous, indelicate, unbecoming, ungenteel, unseemly