noun which may take the genitive case particle 'no', noun
one-size-fits-all; free size
Wasei-eigo term used for clothing and accessories that are designed to fit a wide range of body sizes without specific size options.
wasei-eigo (Japanese-coined English), from free size
This hat is one-size-fits-all, so anyone can wear it.
I bought free-size socks, but they were bigger than I expected.
This sweater is one-size-fits-all, so anyone can wear it.
I bought a one-size-fits-all hat.