out of style
No longer considered fashionable, trendy, or popular. Bell-bottom jeans went out of style decades ago, Dad. Get with the times! The film noir genre was hugely popular in the late 1940s before falling out of style.
out of style
and out of fashionnot fashionable; old-fashioned; obsolete. (See also go out of fashion.) John's clothes are really out of style. He doesn't care if his clothes are out of fashion.