unfashionable

US /ʌnˈfæʃ.ən.ə.bəl/
UK /ʌnˈfæʃ.ən.ə.bəl/
"unfashionable" picture
1.

not in fashion; not popular or current

:
His clothes were old and unfashionable.
It's considered unfashionable to wear socks with sandals.