If they are in civvies, how would we know if they are in Starfleet of not? Maybe they are just visiting passengers.
At any rate, here is the woman sunbathing in "Elaan of Troyius:"
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Totally missed that on the rewatch. Thanks. I'll error on the side of "there aren't many instances and will take any that look like what I'm going for.
I think we are again seeing an instance of budget limitations. In "This Side Of Paradise" only Spock wears civilian attire after being overcome by the spores. McCoy, Sulu, DeSalle and the rest of the crew remain in their Starfleet uniforms even while doing field work down on the planet. Logically, after being taken over by the spores, they should all have chucked their uniforms for civilian clothes.
Budget considerations constrained a lot of what they did. Costuming only had so many green jumpsuits and the the colonists were wearing most of them.