(covers information from several alternate timelines)
Klingon Defense Force uniforms are the uniforms worn by Klingon warriors. Sometimes, an officer may wear a sash with a symbol to signify their noble House and rank. They may also wear the symbol on their sleeve. Most of the uniforms acted as armor in hand-to-hand combat.
In the 22nd century, the Klingon Defense Force did not appear to have uniforms, per se; what they did wear was a garb which was brown and leather-based. They did not carry as many medals and ornaments as in later years, but their gear consisted of edged weaponry or d'k tahgs, primarily for close combat. These were worn in a sash around their shoulder, which may or may not have carried their House symbol. In addition, animal skins and furs were worn.
By the 2260s, Klingon uniforms were made of gold-colored, metallic substances. Commanding officers would wear sashes across their left shoulder. Every wore a black, long-sleeved undershirt, with a gold-colored vest on top. They wore trousers made out of the golden-black-patterned fabric, but in a different hue. Apart from that, s wore black long boots as well as a black belt with a characteristic belt buckle with six round disks and a Klingon disruptor on the left.
From 2266 to 2267, all Klingons wore two golden buttons on the upper part of the black undershirt, just over the seam of the gold-colored vest. The only person seen not wearing these buttons was Kor, as he wore a sash. Kor, himself, wore a badge on his sash, maybe a House logo, and Kang wore the same sash and badge. Kor's lieutenant wore the two buttons, but also a different badge on his left shoulder.
By 2268, the buttons were replaced by rectangular, colored pins, made out of a substance similar to mother-of-pearl. Every Klingon wore two of these pins, one on the left and another, of the same color, on the right. Some officers had golden pins, some had silver ones and some had purple ones. Kang wore two golden pins on the right side. The sash was draped over the other side. Kang's first officer had two blue pins on his right and two blue pins on his lefter side. Mara was the only Klingon seen with pins of different colors on one uniform. She wore a purple and a yellow pin on both shoulders.
By 2269, Klingon uniforms were also observed with more cool-colored, silver-lavender fabric, in place of the previously noted gold material, worn with a version of the familiar, studded, angular belt buckle that has been a staple of Klingon uniforms for over one hundred years.
Shortly afterwards, the Klingon Defense Force adopted a new uniform. The basic form consisted of a black tunic and black trousers, topped with metallic gray armor vests and large shoulder pads. Several variants on this uniform type were seen: some warriors did not wear the undershirt, and some officers wore sashes or stoles over the vests. Other warriors, like Vixis, wore a sleeveless vest version. When officers wore sashes, they generally went across their right shoulder, as opposed to their left. Klingon warriors of the time often wore special, pronged, fingerless gloves on their hands, to give them more of an advantage in hand-to-hand combat. Some very high-ranking Klingon officers (like Colonel Worf, Brigadier Kerla, General Chang, and Chang's subordinates who accompanied Chancellor Gorkon to the Khitomer Conference) wore a black, more leather-like version of this uniform, often accompanied by a sash.
Alternate reality 2250s
In 2259 of the alternate reality, all Klingon warriors wore helmets that were designed to resemble cranial ridges, and bore protruding nose and cheek guards. Some officers wore a long coat with a sash bearing the Klingon insignia, while others wore armor over a gloved jumpsuit, though it had an identical collar and lines resembling the sash with the Klingon emblem.
Late 23rd-24th century
After 2290, the Klingon uniform combined elements from the 2260s and 2280s uniforms. Warriors wore a silver metallic uniform with large shoulder pads and the six-button belt buckle. Officers sometimes wore a special stole over their shoulders, showing medals from past achievements. The black, leather-like variant previously worn by higher-ranking Imperial officers was still worn as well, though rarely. The standard uniform was also worn by officials in the Klingon High Council, including the Chancellor, as well as by the personal guards of Klingon Great Houses, suggesting that its significance was not purely military.
By 2380, the Klingon uniform had again been changed. It bore some similarities to its previous design, albeit with a more streamlined appearance, and the addition of maroon-colored elements. (LD: "Envoys", "Temporal Edict")
|Uniforms of the Alpha Quadrant|
|Andorian Imperial Guard • Bajoran Militia • Cardassian Central Command • Ferengi Alliance • Klingon Defense Force |
• Romulan Star Empire • Starfleet • Talarian military • Tamarian military • Vulcan High Command
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Into Darkness
Several badges from different Klingon uniforms were sold off on the It's A Wrap! sale and auction on eBay.        Other items which were sold off are two pairs of Klingon spats  , a belt buckle , a tabard , a shoulder aglet , and other costume accessories.