That is no longer in fashion or accepted use; antiquated.
The Century Dictionary (Public Domain)
Use "out-of-fashion" in a sentence
"These are some of their makeovers, from simple or out-of-fashion interiors to contemporary homes with a well defined personality."
"Previously The L.A. Art Boom What I find most surprising about what we see of the Resnicks 'collection is that two wealthy Southern Californians with no particular European or traditionalist background have dedicated themselves to collecting such out-of-fashion art."
"Thank God for Thomas Spence ( "How to Raise Boys Who Read," Taste, Sept. 24), who not only has the guts to use out-of-fashion words like "taste," "manners" and "barbarian," but to shamelessly claim that they still have value."