Casual duty attire

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Casual duty attire was informal, non-regulation clothing worn instead of a standard uniform while on duty.

On some Starfleet vessels, certain crew members were granted permission, at the captain's discretion, to wear casual duty attire while serving on board. This diversion from the standard uniform code was typically granted to senior officers in specialized positions. (TNG: "Chain of Command, Part I")

22nd Century

T'Pol

In 2153, Enterprise NX-01 science officer T'Pol resigned from the Vulcan High Command. (ENT: "The Expanse") As she was no longer permitted to wear her former uniform as a civilian, she opted to don brightly colored, tight-fitting jumpsuits while on duty. (ENT: "The Xindi"). After T'Pol accepted a commission to Commander in 2154, her civilian jumpsuits were modified to include division coloring, rank insignia, and other details consistent with standard uniforms of the period. (ENT: "Borderland") T'Pol continued to wear variations of her civilian jumpsuits until at least 2161. (ENT: "These Are the Voyages...")

No on-screen reason was given for why T'Pol was not required to wear a standard uniform jumpsuit after becoming a Commander in Starfleet. During the entire run of the series, actress Jolene Blalock only wore a traditional Starfleet jumpsuit in two episodes, both in the third season: in "Twilight", during scenes depicting an alternate future, and in "Hatchery", when T'Pol was disguised as another crew member.

Orange-red jumpsuit (2154)

Purple jumpsuit (2154)

Blue jumpsuit (2154)

White jumpsuit (2154)

Orange-red jumpsuit with name and Starfleet patches (2161)

Purple jumpsuit with name and Starfleet patches (2161)

Blue jumpsuit with name and Starfleet patches (2161)

23rd Century

Starfleet Captains

Starfleet ship captains also had a choice of relaxed clothing to wear when on duty. James T. Kirk favored multiple variations of a wrap-around tunic, which were available by 2266. (TOS: "The Enemy Within"; TOS: "The Doomsday Machine")

Kirk green tunic with collar rank.jpg

Green tunic with golden rank stripes on shoulder (2266)

Kirk green tunic with gold piping.jpg

Green tunic variation, edged with golden piping (2267)

Medical Officers

The short-sleeved tunic in 2266

As early as 2266, a short-sleeved tunic was available to Starfleet medical officers serving aboard starships. While many medical officers wore the traditional uniform of the time, USS Enterprise Doctors McCoy and M'Benga often wore the short-sleeved tunic when on duty. (TOS: "The Corbomite Maneuver"; TOS: "A Private Little War")

Engineering Captains

The engineering vest in 2293

By 2286, Starfleet permitted captains of engineering to wear a vest with pockets to hold various engineering instruments, which was worn over the white undershirt instead of the more formal service jacket. (Star Trek IV: The Voyage Home)

Actor James Doohan also wore this vest as part of Scotty's costume when he appeared in "Relics", an episode of Star Trek: The Next Generation's sixth season.

24th Century

Deanna Troi

Between 2364 and 2370, Deanna Troi frequently wore casual, nonuniform attire while on duty as ship's counselor, as an alternative to a standard Starfleet uniform. She primarily favored unitards in a variety of colors. (TNG: "The Naked Now" – TNG Season 6) Occasionally, she wore a turquoise variant with a long skirt. (TNG: "The Survivors")

Troi wearing a gray unitard with green belt (2364)

A gray unitard with red belt (2364)

A variation of the gray unitard, with a pointed neckline (2364)

A maroon unitard with a navy banded collar (2366)

A turquoise variant with flowing skirt and matching shoes (2366)

A purple unitard with lavender banded collar (2368)

While serving under Edward Jellico in 2369, she was ordered to wear a standard uniform while on duty. (TNG: "Chain of Command, Part I") After Jellico's order, she wore a traditional uniform almost exclusively during the rest of her posting aboard the USS Enterprise-D. (TNG Season 6 - Star Trek Generations)

Aside from wearing the skant uniform during "Encounter at Farpoint", actress Marina Sirtis wore a standard blue uniform in only one instance before the sixth seasons's "Chain of Command, Part I" - in the fictional future presented in the fourth season's "Future Imperfect". After "Chain of Command", Sirtis wore the unitard costumes only a few times, usually in scenes depicting Troi off-duty.