The raw materials for making clothes fall into three categories: synthetic fibers made from petroleum, natural fibers grown or raised on farms, and semi-synthetic fibers made from wood pulp. Global fiber production hit an all-time high of 124 million tonnes in 2023, with petroleum-based polyester dominating at 57% of the total. Cotton comes in a distant second, and everything else fills in the remaining share.
Polyester: The Dominant Raw Material
More than half of all clothing fiber produced today starts as crude oil. Polyester is made by combining two petroleum-derived chemicals: para-xylene (refined from oil) and ethylene glycol (a simple alcohol). These are reacted together to form a plastic polymer that gets melted and extruded into thin fibers, then spun into yarn. Annual production of polyester tops 53 million tonnes. It’s cheap, durable, wrinkle-resistant, and easy to dye, which is why it shows up in everything from t-shirts to dress pants to athletic wear.
Nylon is the second most common synthetic fiber. Its chemistry differs from polyester, but it also starts with petroleum. Nylon is especially common in stockings, activewear, and outerwear because of its strength and slight stretch. Stretchy fabrics like those in leggings and swimsuits typically contain spandex (also called elastane or Lycra), which is built from a polymer called polyurethane. Spandex is rarely used alone. It’s usually blended at 5-20% with cotton or polyester to add elasticity.
Cotton: The Leading Natural Fiber
Cotton is the most widely used natural fiber in clothing, with global production around 24.4 million tonnes in 2023. The fiber grows in protective bolls around the seeds of the cotton plant. After harvesting, the bolls are ginned to separate the fluffy fibers from the seeds, then the fibers are cleaned, carded into alignment, and spun into yarn.
India and China together produce roughly 45-50% of the world’s cotton. The United States is the third-largest producer, with Texas alone accounting for about 40% of U.S. output, mostly concentrated in the High Plains region. Brazil rounds out the top four. Together, these four countries grow 70-75% of global cotton. The U.S. exports about 35% of all cotton traded internationally, making it the world’s leading exporter even though it produces less than India or China.
Cotton’s appeal is straightforward: it breathes well, absorbs moisture, feels soft against skin, and holds up to repeated washing. It’s the go-to fiber for everyday basics like jeans, underwear, and t-shirts.
Wool, Silk, and Other Animal Fibers
Animal fibers make up a small but significant slice of the clothing market. Wool from sheep accounts for about 1.1 million tonnes annually, while all other animal fibers combined (cashmere from goats, mohair from Angora goats, alpaca, angora from rabbits, yak, and camel) add just 0.05 million tonnes. Altogether, wool represents roughly 1% of global textile fiber. Its value per kilogram is much higher than cotton or polyester, though, which is why it remains commercially important for sweaters, suits, and cold-weather gear.
Silk production is similarly small at about 0.16 million tonnes per year. Silk fibers are harvested from the cocoons of silkworms, which spin a single continuous thread up to a mile long as they pupate. That continuous filament gives silk its distinctive smoothness and sheen. It’s used primarily in formalwear, scarves, and linings.
Leather isn’t a fiber but deserves mention as a major animal-derived clothing material. It starts as raw animal hide, most often from cattle, which is then chemically treated through a process called tanning to prevent decay and add flexibility. Most commercial leather is tanned with chromium-based chemicals, a process that produces significant hazardous waste including chromium, sulfides, and concentrated salts.
Linen, Hemp, and Other Plant Fibers
Linen comes from the flax plant, and hemp fiber comes from the cannabis plant (a variety bred for fiber, not the psychoactive kind). Both are “bast fibers,” meaning the useful material sits in the stem of the plant rather than in a seed pod like cotton. Their chemical compositions are remarkably similar: both are primarily cellulose with smaller amounts of pectin, lignin, and hemicellulose binding the fibers together.
Turning these plants into usable textile fiber requires breaking down that binding material. The most common method is dew retting, where cut stems are left in the field for weeks so moisture and microorganisms naturally dissolve the pectin. Other approaches include soaking in water (water retting), enzyme treatments, and steam explosion. After retting, the fibers are mechanically separated from the woody core of the stem, then spun using techniques adapted from linen, cotton, or wool spinning systems.
Linen is prized for warm-weather clothing because it conducts heat away from the body and dries quickly. Hemp is more durable and is gaining popularity in casual and workwear. Both remain niche compared to cotton and polyester.
Wood Pulp Fibers: Viscose, Modal, and Lyocell
Sitting between natural and synthetic, semi-synthetic fibers start with plant cellulose (usually from trees) but require heavy chemical processing to become textile-ready. They accounted for about 6% of global fiber production in 2023, totaling 7.9 million tonnes. The most common types are viscose (also called rayon), modal, and lyocell.
Viscose rayon starts with wood that’s mechanically broken down into cellulose pulp, then dissolved in chemicals to create a thick liquid that’s pushed through tiny holes and reformed into fibers. The result feels soft and drapes like silk at a fraction of the cost. Modal uses the same general approach but relies entirely on beechwood trees as its raw material and produces a fiber that’s especially soft and resistant to shrinking. Lyocell (often sold under the brand name Tencel) uses a more flexible process that can work with lower-grade cellulose sources, including bamboo, hemp, cotton byproducts, and even recycled textiles.
One less obvious raw material in this category is cotton linters, the short fuzz left on cotton seeds after the longer fibers are removed for spinning. These linters are a byproduct of cottonseed oil production and serve as the cellulose source for cupro, a type of rayon with a particularly silky feel. Since linters are a waste product that would otherwise go unused, they’re considered a more sustainable starting point than harvesting hardwood trees.
How the Market Breaks Down
The overall picture of clothing raw materials in 2023 looks like this:
- Polyester and other synthetics: roughly 64% of all fiber, dominated by polyester at 57%. This includes nylon, spandex, and acrylic.
- Cotton: about 20% of global production at 24.4 million tonnes, down slightly from the year before.
- Wood-based semi-synthetics: 6% of the market, growing slowly as brands look for alternatives to petroleum.
- Wool and animal fibers: around 1%, with sheep wool making up the vast majority.
- Other plant fibers: linen, hemp, jute, and similar bast fibers fill a small remaining share.
The shift toward synthetics has been dramatic. Fifty years ago, cotton was the dominant clothing fiber worldwide. Today, petroleum-based materials make up nearly two-thirds of everything produced. The raw materials for your wardrobe, in other words, overlap heavily with the raw materials for fuel, plastics, and industrial chemicals. That connection drives much of the current conversation around sustainable fashion and the search for bio-based or recycled alternatives.