This relates to the period 2266 to 2373. 2266 equates to [TNG] Season 3; well into that year the [TNG] Seasons 1 and 2 uniforms were slightly amended. The amended uniforms endure for the rest of [TNG] i.e. up to and including 2370, a year before the [Voyager] series begins. This means that the USS Enterprise NCC-1701-D crew carry on wearing the uniform even though a version new to tv viewers is seen in the next Star Trek series [DS9] and whose first two Seasons are aired at the same time as the last two Seasons of [TNG]; that new version is presented as simply a variant of the existing uniforms system.
For the new [Voyager] series, no changes to the uniform were made and so the USS Voyager crew wear the same uniform variants as seen in the first two Seasons of [DS9]. However, a re-styled Starfleet emblem/combadge is introduced for [ST VII: Generations] and for the [Voyager] series and it is thus adopted by Starfleet from 2371.
The new emblem/combadge appears in [ST VII: Generations], [DS9], [ST VIII: First Contact], [Voyager] of course, [ST IX: Insurrection] and [ST X: Nemesis].
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the shirt and undershirt
THE SHIRT AND UNDERSHIRT
For both the standard duty uniform and dress uniform for all departments, the garment worn beneath the jacket is a grey short-sleeved or long-sleeved shirt, both with high collar. The rank pips are worn on the front right of the collar. Under the shirt, a grey undershirt can be worn. (The undershirt, if called a 'vest' by Britons, as 'vest' is the British term for that item of clothing, should not be confused with the 'vest', a garment worn over the shirt and seen in [ST VIII: First Contact]. Sources do not give details about the undershirt but do occasionally refer to it as 'undershirt'.)
The undershirt style might be retained (pictorial evidence awaited....when I next watch the relevant [DS9] and post-2373 films with an eye open specifically for underwear!) throughout Starfleet until at least 2378, enduring through the new uniforms style introduced by Starfleet in 2373. This undershirt style is certainly worn by USS Voyager crew throughout their stay in the Delta Quadrant i.e. to the end of 2377.
Janeway takes her jacket off [#54 Macrocosm]
Janeway with jacket and shirt off [#54 Macrocosm]
Janeway with jacket off [#54 Macrocosm]
Above: Janeway removes her jacket to reveal the long-sleeved grey shirt. She removes this and continues to wear the grey undershirt beneath it.
Torres [#102 Nothing Human]
Torres removes her jacket near the start of an away mission on board a stricken Malon freighter; views - front, side and removing the vest as she enters the sonic shower after the mission [#115 Juggernaut]
short-sleeved, high-necked top: Janeway in her private quarters; [#105 Latent Image]
long-sleeved, high-necked top: Janeway in her private quarters; [#139 Child's Play]
long-sleeved, high-necked top: Tuvok; the righthand picture shows him meditating in the brig; [#150 Repression]
rear view
Tuvok wears a long-sleeved, high-necked top, on top of the undershirt, while Paris wears the short-sleeved top; [#107 Gravity].
![this page covers part of the [Voyager] era](unifpics/voy_splash_by_janet.jpg)
