1. The Movie-era Starfleet Uniform (2278-2350)
Star Trek has some of the most recognized and iconic uniforms in the history of science fiction, for better or worse. The majority of Starfleet uniforms are well designed and thought out, then there is the uniforms from ST:TMP...the horror...the horror. To me, the original cast movie-era uniforms are simply the best of any Trek uniform and the most striking, especially when compared to the uniforms seen previously Trek works. Also, it seems like this uniform would be easy to live with, unlike a number of the TNG uniforms, and you could "feel" like you were serving in a military organization with a uniform like this. According to behind-the-scenes information, the turtleneck quilted undershirt was made with a sewing process called "trapunto" and the during the production of ST:TWOK, there was only a single needle to sew the undershirts in all of the west coast, due to the process being out-of-fashion for many years. Due to this and other reasons, the undershirt turtleneck is often the hardest element for most cosplayers and even when these uniforms were seen on TNG, the turtleneck was deleted. Oh, and the "bomber jacket" variant is awesome.
2. The Enterprise-era Starfleet Uniform (2140-2161)
I make no secret that Star Trek: Enterprise is one my favorite Trek series, and that it's cancellation was the final nail in the coffin for my Trek fandom. In the days prior to Kirk and Spock, the beginning days of Starfleet saw the use of a jumpsuit-style blue uniform with colored division pipping and a home assignment patch, and a black Henly undershirt. To me, the Enterprise uniform seemed based on the NASA astronaut jumpsuits or USN submarine uniforms and they were an attempt to have a more realistic look than the TOS era uniforms. Much like the ST:TWOK era uniforms, I could wearing this and it being a livable uniform.
3. The Stargate Atlantis Expedition Uniform (Seasons One-Three)
I was never much for the original Stargate 1994 movie, nor the SG1 TV series, but for some reason, the concept of Atlantis really appalled me, and I rather liked the uniforms of the multinational Atlantis Expedition. According to the wikipedia article, the 2004 Expedition designed the uniforms to separate the military element and the civilian element through the use of colors, and they rather look like Starfleet uniforms, and the in-show dialog mocked this as well. Once again, this looks like a uniform that you actually wear, but it seems more sloppy than more traditional military uniforms, especially the way that rebel-with-a-P90 Colonel John Sheppard wears it. After season three, the uniforms were altered, with some of the main characters getting black collar-less leather jackets.
4. The Classic Battlestar Galactica Colonial Warriors Uniform
This is one of the military sci-fi uniforms I grew up with and I've always felt that it was a damn-fine looking uniform with an awesome suede leather jacket. While the colors of the uniform were taken from fashions of the late 1970's, the sci-fi touches made the Colonial Warrior uniforms a real standout, even over the other Galactica crew. You weren't cool onboard the Galactica unless you were donning on of these bad boys. Some costuming website I've researched have said that until recently, this was one of the hardest and most costly sci-fi uniforms, due to the base light brown uniform and the suede material. Recently, Magnoli Clothiers offers an accurate "Galactica" jacket...for $750 and yes, I thought about buying one.
5. The Star Force uniform from Starblazers/Space Cruiser Yamato
6. The 2063 USMC Uniform from Space:Above and Beyond
I make no secret on how much I fucking love this show, and very soon, FWS will be writing an entire blogpost to that very subject. In this 1995-1996 Fox MSF television show, the United States Marine Corps of 2063-64 wears a familiar base uniform throughout the show: the military OD flight jumpsuit with black mock turtleneck undershirt. Throughout the show, the 58th core cast dons these OD jumpsuits in the cockpit of the Hammerhead fighter and during on-planet dirtside operations, even on worlds that are ot atmospheric standard. This means that these jumpsuits are actually an streamlined environmental suit rather than just normal flight suit. Dotted with all manner of patches, pins, and pockets, the SAAB USMC jumpsuit is completely functional and most likely the most realistic military science fiction seen on-screen because the actually uniform used by the production crew was ordered from (according to rumor) US Calvary. Unlike many of the uniforms seen on this list and most other sci-fi works, the SAAB USMC flight jumpsuit is an easy, cheaper uniform to cosplay, but nearly no one would know who the hell you are dressed up as. Pity.
7. The House Atreides Military Uniform from DUNE (1984)
Say what you want about David Lynch's 1984 DUNE adaption to the sliver-screen, the costuming was epic and that extends to the military uniform of House Atreides. While only seen on-screen for a short amount of time, the House Atreides military uniform is one smart looking uniform that hearkens back to the turn-of-the-century military uniforms of the European powers prior to the First World War. Unlike other uniforms seen on this list that are jumpsuits and rather sloppy, this is a proper uniform that calls you to attention with all the older military touches. Oddly, the 1984 unsuccessful LJN toyline of the DUNE film had the Paul Atreides figure in his House Atreides uniform and not the Freman stillsuit, which he worn more throughout the film, and unlike the film, the LJN figure is wearing an olive-hued uniform, not black. In the pre-production catalog photos, Paul's uniform is a Smurf blue. Sadly, I do not think that will see the like of the House Atreides uniform until a Honor Harrington movie is committed to film.
8. Earth Force Uniform from Babylon 5
During the renaissance of science fiction back on television in the 1990's, there were two sci-fi tv shows about space stations, one was the from the juggernaut of Star Trek and the other was set in a new universe of weird aliens and epic space battles. Unlike DS9, the uniforms of the Terran military were more much "military" looking and were not colored coded like the Starfleet uniforms. Under the snapping looking uniforms was a very-trendy white collarless dress shirt, which were all the rage back in the 1990's. There are many pictures of me in high school with collarless shirts, and a few still survive, lurking around the very back of my closet. While B5 may have been the cheaper cousin to Deep Space Nine, the production crew developed one of the better future military organization uniforms of all time.
9. High Guard Uniform from Gene Roddenberry's Andromeda
After the death of the original Trek in the 1960's, Gene Roddenberry developed a new show about Dylan Hunt, an astronaut who was placed into cryogenic freeze and awake in a post-apocalyptic future, and Hunt attempted to restore civilization. The basic plot elements were recycled and reimagined from Genesis II into Andromeda. In the series from 2000-2005, Dylan Hunt was one of the sole survivors of the Systems Commonwealth High Guard. From some of the series, Hunt would wear the uniform of the High Guard which is an older style uniform that a nice look on screen and while it took touches from the Starfleet uniform, it was it's own uniform. Oddly, in the first episode, the High Guard crew of the Andromeda buckled tunics are a redish color with tan pants, then once Hunt is awoke, he dons a black uniform. The uniform is completely abandoned by the 4th season. It is a shame that the series started off on a such an interesting note, and boiled down to nothing.
10. The United Planets Uniform From Forbidden Planet (1956)