OBSOLETE
behind the times
old-fashioned.Sarah is a bit behind the times. Her clothes are quite old-fashioned.Our legislature is a bit behind the times.
out-of-date
old-fashioned; out of style; obsolete.Isn't that suit sort of out-of-date?All my clothes are out-of-date.
out of step
not as up-to-date as someone or something.John is out of step with the times.Billy is out of step with the rest of the class.
out of style and out of fashion
not fashionable; old-fashioned; obsolete.John's clothes are really out of style.He doesn't care if his clothes are out of fashion.