Wiktionary
clothing optional
a. (context naturism English) Allowing and encouraging nudity but tolerating the wearing of clothes, as between nudist and clothing compulsive. Abbreviation: C.O.
Usage examples of "clothing optional".
Kayla tried not to look-it seemed as if wherever this was, it was strictly clothing optional.
Kayla tried not to lookit seemed as if wherever this was, it was strictly clothing optional.