Casual duty attire Casual duty attire was informal 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 . ( ) 22nd century . T ' Pol ' s uniform . In 2153 , science officer T ' Pol resigned from the Vulcan High Command . ( ) 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 . ( ) 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 . ( ) T ' Pol continued to wear variations of her civilian jumpsuits until at least 2161 . ( ) 23rd century . Wraparound tunic . Mid 2260s - Early 2270s . Captain s had a choice of relaxed clothing to wear when on duty , in the form of a wraparound tunic . James T . Kirk favored two green variations . Charles Evans also wore a beige version of this tunic , though where it originated from is unknown . ( ) The captain of the also had a green tunic when the ship disappeared through a spatial rift in 2268 , to reemerge in the mirror universe in the year 2155 , where found the tunic in his quarters and wore it himself . ( ) Mid 2270s . This wraparound tunic was worn by Lieutenant Commander Hikaru Sulu shortly before the departed drydock to confront " V ' ger " and during Admiral Kirk ' s briefing to the entire crew . This tunic had short sleeves and was worn over a black undershirt . Epaulet s denoting rank were found on the tunic . Pants matching the color of the jacket were also worn . A metal Starfleet emblem found near the waist on the jacket was used to close it over the undershirt . ( ) Bomber jacket . In keeping with the Starfleet practice of allowing officers of command rank to wear a less formal variant of the uniform , starting in the late 2270s command officers were given the option of wearing a suede leather bomber jacket version of the uniform . This was worn over the department color turtle neck . ( , , ) 24th century . Deanna Troi ' s duty attire . 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 Season 6 ) Occasionally , she wore a turquoise variant with a long skirt . ( ) While serving under Edward Jellico in 2369 , she was ordered to wear a standard uniform while on duty . ( ) After Jellico ' s order , she wore a traditional uniform almost exclusively during the rest of her posting aboard the . ( TNG Season 6 – ) Background information . Troi ' s low - cut outfits were a throwback to the costumes of . ( ) The costumes were all cut differently and some were lower than others , exposing more of Troi actress Marina Sirtis ' cleavage to the camera . ( " " , p . 102 ) In the " Stardate Revisited " documentary included with the TNG Season 1 Blu - ray collection , Marina Sirtis described the " gray unitard " outfits from the first season as being made of denim ( " . . . and not the stretchy kind . . . like wearing skin - tight jeans up to your neck " ) . Those costumes were an attempt to design an outfit for Troi that would be more flattering than the " skant " uniform , which she wears in TNG pilot . " " So they came out with the ugly gray spacesuit , " " Sirtis recalled , " " and they put a belt in a lighter - colored fabric exactly where my fat was . " " ( " " , p . 101 ) In essence , Sirtis hated those grey costumes . ( " Cinefantastique " , Vol . 23 , No . 2 / 3 , p . 77 ) At the start of Season 2 , Troi ' s maroon - colored costume was designed by then - new TNG Costume Designer Durinda Rice Wood . Marina Sirtis found it " much more flattering " than the grey unitards . ( " Cinefantastique " , Vol . 23 , No . 2 / 3 , p . 77 ) Costume Designer Robert Blackman , who succeeded Wood , didn ' t approve of the jumpsuit , however . " " I kept wondering why her uniform was a slightly different color , and more vulnerable - looking , " " he said . " " I was told that it was " not " a uniform – they are day clothes . I said it was not happening for me . " " ( ) Marina Sirtis cited Robert Blackman as the originator of Troi ' s " wardrobe " of casual attire . " " He came up with the idea that if Troi ' s not wearing a Starfleet uniform , then she should have more than one outfit to wear , " " the actress noted . ( " Cinefantastique " , Vol . 23 , No . 2 / 3 , p . 77 ) Troi ' s blue - green dress was designed by Robert Blackman . It was inspired by him having the opinion that she needed to look more vulnerable and softer than the maroon outfit made her seem . " " So I came up with a fabric that ' s a wonderful shade of blue - green , " " he commented , " " with the asymmetrical neckline , a dress and pants . " " According to Blackman , both he and Marina Sirtis were happy with the dress , as were most other people . Blackman thought the dress gave Troi a softer image and made her appear less officious , giving the impression she was more accessible . ( ) However , Sirtis described the garment as , " " That green dress , the one you wanted to straighten out the neckline on all the time . " " She went on to say , " " I wasn ' t crazy about the dress , because you had to take the whole thing off to go to the bathroom . But the underwear was fabulous . I had to wear a corset like a merry widow , and then we had what I like to call the industrial - strength , Starfleet - regulation brassiere . This became the standard uniform for every woman on " Star Trek " , and that ' s because the women saw me as me and then they saw me as Troi , and they went , ' I want a bra like that , ' because it adds inches where there really are none . It is kind of depressing at the end of the day when you take it off . " " ( " " , p . 102 ) Aside from wearing the skant uniform during " Encounter at Farpoint " , Marina Sirtis was always shown wearing casual duty attire except in one instance before the sixth season episode – in a fictional future presented in the Season 4 installment . After " Chain of Command " , Sirtis wore the unitard costumes only thirteen more times , predominantly in post - duty - shift settings , and always appeared in a standard Starfleet uniform as well . Those subsequent episodes were , , , , , , , and series finale . Captain ' s variant . By 2368 , Starfleet had a uniform variant available to commanding officers in service aboard starships , consisting of a red command division suede jacket featuring banded cuffs and either leather or fabric black shoulders . Less formal than the standard duty uniform , this " captain ' s jacket " was a more casual dress option , with trousers reminiscent of the previous Starfleet uniform . ( )