Jeans are pants, or trousers, made from denim. Mainly designed for work, they became popular among teenagers starting in the 1950s. Historic brands include Levi's and Wrangler. Today, jeans are a very popular form of casual dress around the world and come in many styles and colors, with the "blue jeans" particularly identified with the American culture, especially the American Old West. Americans spent more than $14 billion on jeans in 2004.
Jeans fabric was made in Chieri, a town near Turin (Italy), in the 1600s. It was sold through the harbour of Genoa, which was the capital of an independent republic, and a naval power. The first were made for the Genoese Navy because it required all-purpose pants for its sailors that could be worn wet or dry, and whose legs could easily be rolled up to wear while swabbing the deck. These jeans would be laundered by dragging them in large mesh nets behind the ship, and the sea water would bleach them white. According to many people the jeans name comes from bleu de Gênes, i.e., blue of Genoa. The raw material originally came from the city of Nîmes (France) Serge de Nîmes i.e. denim.
 Riveted jeans
A German-Jewish dry goods merchant Levi Strauss was selling blue jeans under the "Levi's" name to the mining communities of California in the 1850s. One of Strauss's customers was Jacob Davis, a tailor who frequently purchased bolts of cloth from the Levi Strauss & Co wholesale house. After one of Davis's customers kept purchasing cloth to reinforce torn pants, he had an idea to use copper rivets to reinforce the points of strain, such as on the pocket corners and at the top of the button fly. Davis did not have the required money to purchase a patent, so he wrote to Strauss suggesting that they both go into business together. After Strauss accepted Davis's offer, the two men received , for an "Improvement in Fastening Pocket-Openings," on May 20, 1873.
In 1885 jeans could be purchased for $1.50. Today, some jeans cost $200 to $500 with limited-edition and collectibles costing up to $2000.
 Jeans in popular culture
 Blue jeans
Initially, blue jeans were simply sturdy trousers worn by workers, especially in the factories during World War II. During this period, men's jeans had the zipper down the front, whereas women's jeans had the zipper down the right side. By the 1960s, both men's and women's jeans had the zipper down the front. In the United States during the 1950s, wearing of blue jeans by teenagers and young adults became symbolic of mild protest against conformity. This was considered by some older adults as disruptive; for example, some movie theaters and restaurants refused to admit patrons who wore blue jeans. During the 1960s the wearing of blue jeans became more acceptable and by the 1970s had become general fashion in the United States, at least for informal wear. Notably, in the mid-1950s the denim and textiles industry was revolutionized by the introduction of the stone-washing technique by GWG (Great Western Garment Co.). Entrepreneur, importer, and noted eccentric Donald Freeland of Edmonton, Alberta pioneered the method, which helped to bring denim to a larger and more versatile market. Denim suddenly became an attractive product for all age groups and Freeland became one of the most important innovators in the history of denim and denim products. It should be noted, also, that Freeland contributed to a variety of other denim textile developments throughout his career with Great Western Garments (GWG) Acceptance of jeans continued through the 1980s and 1990s to the point where jeans are now a wardrobe staple, with the average North American owning seven pairs.
As imported American products, jeans were somewhat expensive, especially in the case of the Soviet Union which restricted hard currency imports. In Spain they are known as vaqueros or "cowboys," in Danish cowboybukser meaning "cowboy pants" and in Chinese niuzaiku (SC: 牛仔裤), literally, "cowboy pants" (trousers), indicating their association with the American West, cowboy culture, and outdoors work. Similarly, the Hungarian name for jeans is "farmernadrág", meaning "farmer-trousers".
Jeans can be worn very loose in a manner that completely conceals the shape of the wearer's lower body, or they can be snugly fitting and accentuate the body. Historic photographs indicate that in the decades before they became a staple of fashion, jeans generally fit quite loosely, much like a pair of bib overalls without the bib. Indeed, until 1960, Levi Strauss denominated its flagship product "waist overalls" rather than "jeans".
 Blue jean insulation
Recycled blue jean is becoming a popular insulation material (sometimes called Cotton Batt insulation) used in the construction of houses. Due to its low relative synthetic chemical composition and because it is made of recycled materials, it is gaining prominence in green building circles. Like conventional insulation, it moderates heat transfer and reduces sound transfer between floors or rooms. Blue Jean insulation has an R-Value of 13 to 19 (for 3.5 and 5.5 inch batts, respectively) making it a preferable insulator to typical fiberglass batts even without taking into account the environmental considerations.
Fits of jeans are determined by current styles, sex, and by the manufacturer. Here are some of the fits produced for jeans:
- Ankle jeans
- Baggy jeans
- Boy cut
- Carpenter jeans
- Hip-huggers/Low-rise jeans
- Phat pants
- Relaxed Fit/Loose
- Skinny jeans
- Straight jeans
- Jorts (Jean shorts)
- Boot cut
Jeans come in many styles and fits based on the manufacturer; some of the more popular brands include Lee's, Levis, Urban Pipeline, Unionbay, NoBoundaries, and Wranglers. The styles popular of teenagers include yellow and white fades to look as if they have been worn down and been worked in. Some brands even sell vintage looks where the legs are pre-scrathed and torn before use.
Rises in jeans (the distance from the crotch to the waistband) range from high-waisted to superlow-rise (Low rise can be called Low Riders). Jeans for men usually have a longer rise and zipper, whereas women have a shorter rise and zipper, although exceptions do exist and this is largely a function of current trends. In decades past, when high-waisted jeans were popular, it was often the women's that featured a longer rise.
Denim is a rugged cotton twill textile, in which the weft passes under two (twi- "double") or more warp fibers. This produces the familiar diagonal ribbing identifiable on the reverse of the fabric, which distinguishes denim from cotton duck. Denim has been in American usage since the late eighteenth century. The word comes from the name of a sturdy fabric called serge, originally made in Nîmes, France, by the Andre family. Originally called serge de Nîmes, the name was soon shortened to denim. Denim was traditionally colored blue with indigo dye to make blue "jeans," though "jean" then denoted a different, lighter cotton textile; the contemporary use of jean comes from the French word for Genoa, Italy (Gênes), where the first denim trousers were made.
A similarly woven traditional American cotton textile is the diagonal warp-striped hickory cloth that was once associated with railroadmen's overalls, in which blue or black contrasting with undyed white threads form the woven pattern. Hickory cloth was characterized as being as rugged as hickory wood—not to mention the fact that it was deemed to be worn mainly by "hicks"—although neither may be the origin of that term [from a nickname for "Richard"]. Records of a group of New Yorkers headed for the California gold fields in 1849 show that they took along four "hickory shirts" apiece. Hickory cloth would later furnish the material for some "fatigue" pantaloons and shirts in the American Civil War.
The word dungarees, to identify heavy cotton pants such as overalls, can be traced to a thick cotton country-made cloth, Dongari Kapar, which was sold in the quarter contiguous to the Dongari Killa, the fort of what was then known as Bombay (Hobson Johnson Dictionary). The word entered English with just this meaning in 1696 (OED). Dongri Fort was rebuilt in 1769 as Fort George, Bombay, where the first cotton mill was established in 1854. Dyed in indigo, the traditional cloth was used by Portuguese sailors and cut wide so that the legs could be swiftly rolled up when necessary. Thus, dungarees have a separate history.
 Dry denim
Dry or raw denim, as opposed to washed denim, is a denim fabric that is not washed after being dyed during its production. Over time, denim will generally fade, which is often considered desirable.
Most denim is washed after being crafted into an article of clothing in order to make it softer and to eliminate any shrinkage which could cause an item to not fit after the owner washes it. In addition to being washed, non-dry denim is sometimes artificially "distressed" to achieve a worn-in look.
Much of the appeal of dry denim lies in the fact that with time the fabric will fade in a manner similar to factory distressed denim. With dry denim, however, such fading is affected by the body of the person who wears the jeans and the activities of their daily life. This creates what many enthusiasts feel to be a more natural, unique look than pre-distressed denim.
To facilitate the natural distressing process, some wearers of dry denim will often abstain from washing their jeans for more than six months, though it is not a necessity for fading. Often, enthusiasts will just hang their unwashed denim to help get rid of the smell.
 Selvage denim
Selvage denim (also called selvedge denim) is a type of denim which forms a clean natural edge that does not unravel. It is commonly presented in the unwashed or raw state. Typically, the selvage edges will be located along the out-seam of the pants, making it visible when cuffs are worn. Although selvage denim is not completely synonymous with unwashed denim, the presence of selvage typically implies that the denim used is a higher quality.
The word "selvage" comes from the phrase "self-edge", the natural edge of a roll of fabric. In this case, denim made on old-style shuttle looms. These looms weave fabric with one continuous cross thread (the weft) that is passed back and forth all the way down the length of the bolt. As the weft loops back into the edge of the denim it creates this “self-edge” or Selvage. Selvage is desirable because the edge can’t fray like lower grade denims that have separate wefts which leave an open edge that must be stitched. Shuttle looming is a more time-consuming weaving process that produces denim of a tighter weave resulting in a heavier weight fabric that lasts.
Shuttle looms weave a more narrow piece of fabric, and thus a longer piece of fabric is required to make a pair of jeans (approximately 3 yards). To maximize yield, traditional jean makers use the fabric all the way to the selvage edge. When the cuff is turned up the two selvage edges, where the denim is sewn together, can be seen. The selvage edge is usually stitched with colored thread: green, white, brown, yellow, and red (red is the most common). Fabric mills used these colors to differentiate between fabrics.
Most selvage jeans today are dyed with synthetic indigo, but natural indigo dye is available in smaller niche denim labels. Though they are supposed to have the same chemical makeup, there are more impurities in the natural indo dye. Loop dying machines feed a rope of cotton yarn through vats of indigo dye and then back out. The dye is allowed to oxidize before the next dip. Multiple dips create a deep dark indigo blue.
In response to increased demand for jeans in the 1950's, American denim manufacturers replaced the old shuttle style looms with modern projectile looms. The new looms produced fabric faster and wider (60-inches or wider), yet lighter and less durable. Synthetic dyeing techniques along with post-dye treatments were introduced to control shrink and twist.