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Memory Alpha
Multiple realities
(covers information from several alternate timelines)

Other versions of the Starfleet uniform from various alternate timelines and parallel universes.

Parallel universes

Uniforms from other universes.

See: Starfleet uniform (mirror)

Quantum incursions (2370)

Lieutenant Wesley Crusher in 2370

One of the parallel universes experienced by Worf during his quantum incursion had a variant of the 2366 Starfleet uniform. Along with the use of pips on the collar, this version also used gold bars behind a silver Starfleet delta to denote rank. (TNG: "Parallels")

This same uniform, sans pips, is seen in Barash's illusion.

Alternate timelines

Uniform changes resulting from a temporal event.

See: Starfleet uniform (alternate reality)

Earth destruction timeline (2153-2165)

Commander Malcolm Reed in an alternate 2165

In an alternate timeline where Captain Jonathan Archer was infected with interspatial parasites, Starfleet continued the use of their 2151 uniforms up until 2165. They did not adopt the addition of personnel names and Starfleet membership patches onto the uniform by 2161, as they did in the regular timeline. (ENT: "Twilight")

Federation-Klingon War timeline (2344-2366)

In the alternate timeline created by the disappearance of the USS Enterprise-C in 2344 and the subsequent outbreak of the Second Federation-Klingon War, the Starfleet uniforms were similar to the ones worn in 2366 in the prime timeline, but had enclosed collars and black cuffs. Phasers were worn at all times in silver belts with an offset buckle, in the shape of a gold Starfleet insignia; enlisted crewmembers had one resembling a Sam Browne belt.

Guinan, who recognized that change in the timeline, told Picard that she noticed how "things [..] just don't feel right," before naming that his uniform was among the things that she noted were "somehow [...] all wrong". When Picard disagreed, and stated that "nothing has changed," Guinan reluctantly agreed, but still affirmed, "I also know it's wrong." (TNG: "Yesterday's Enterprise")

This uniform appeared to have existed in the regular universe, as Geordi La Forge wore it in the last scene of "Yesterday's Enterprise". It is most likely that wardrobe simply forgot to have LeVar Burton change between shots.
The belt buckle resembles the fastener on the wraparound tunic in the late 2260s.
Seven years later in the prime timeline, with the outbreak of the Dominion War, Starfleet officers would also wear phasers on their uniforms while in combat, though without any extra belts.
One of the silver belt-harnesses was sold off on the It's A Wrap! sale and auction on eBay. [1]

Subspace inversion timeline (2372 - early 25th century)

In a timeline where Captain Benjamin Sisko was killed on the USS Defiant during a subspace inversion of the wormhole, and the Dominion War apparently never happened, Starfleet never adopted the 2370s uniform. This timeline did adopt the 2390s uniform seen in other alternate futures. (DS9: "The Visitor")

Future timelines

Uniforms from possible futures.

Slipstream crash timeline (2375-2390)

Captain Geordi La Forge in 2390

In a 2390 where the USS Voyager was destroyed, the uniforms had not yet changed from the 2370s version, although they did accept a new combadge. (VOY: "Timeless")

Starfleet uniform (2390s-2420s)

Several alternate future timelines show this uniform to be in service in the mid to late 2390s, with the combadge coming into service in by least 2390. The actual uniform used in the 2390s was different, though it had a similar combadge and rank insignia placement.

Duty uniform

The duty uniform consisted of a division color double-breasted jacket with, like the Starfleet uniform worn in the 2230s, black piping running across the yoke, and black pants. Rank was displayed in a series of pips on the upper right breast pocket, just above the piping. (TNG: "All Good Things..."; VOY: "Endgame"; DS9: "The Visitor")

Cadet uniform

A cadet in an alternate 2404

Cadets wore uniforms similar to the duty uniform, but the jackets were gray, lacking any apparent rank insignia or division colors to indicate their class. (VOY: "Endgame")

If the class shown was a freshman class, they may not have possessed a rank indicator.

Flag officer uniforms

The uniforms worn by flag officers were similar to the standard uniform, though with additional gold trim running down the edge of the jacket over the right breast and on the cuffs. However, the 2369 version was still in use in the "anti-time future". (VOY: "Endgame"; TNG: "All Good Things...")

Riker may simply choose to wear an old uniform, since Admirals have been shown to have a wide latitude with their uniforms.


Background information

The Starfleet uniforms worn during Star Trek: The Original Series were designed by William Ware Theiss, who returned to design the Star Trek: The Next Generation uniforms (which were further adapted into future versions on DS9, VOY, and the TNG-era films by Robert Blackman).

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