Civilian clothing was any clothing item worn by non-military members or in a non-military setting.

In 2063, Jean-Luc Picard requested mid-21st century civilian clothing from USS Enterprise-E's computer as members of his crew prepared to head down to Earth. (Star Trek: First Contact)

In 2151, Jonathan Archer recommended an impregnated Trip Tucker wear civilian clothing for the duration of his condition, as it would help hide the bulge. (ENT: "Unexpected")

In 2369, upon Stefan DeSeve's return from his Romulan defection, William T. Riker ordered him to dress in civilian clothes, saying he didn't want to see DeSeve in a Romulan uniform anymore. (TNG: "Face of the Enemy")

In a deleted scene from ENT: "The Expanse", Hoshi Sato decided to send her off-duty clothes to her mother in exchange for new ones in order to "upgrade my civvies".

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