The cotton-versus-polyester argument still comes up in sourcing meetings and everybody knows their lines. Farm on one side, cracker plant on the other. It quit describing how fiber gets chosen years ago, and nobody in the room seems to mind.
World fiber production ran to about 132 million tonnes in 2024. Polyester was 59 percent of that, cotton roughly 19 percent. Fiber recycled out of old clothing, which takes up most of the conference programming, finished under one percent.
The fiber decision also gets made a long way from the design room. A developer can pick exactly the right material for the product and still lose the program on where the duty falls.
Cotton has to defend its share
Cotton still has something hard to engineer around. It handles moisture the way people expect a shirt to, and nobody has ever needed it explained to them. In tees, denim and underwear that’s worth real money. On the shelf, it’s worth more, because the word on the label does work no spec sheet can do.
It’s a crop, and that’s where cotton loses. Weather, water, pests and whatever corn is paying that year all get a vote. A polyester producer can push output to the limit of installed capacity inside a few weeks. A grower makes the call months before the fiber ever sees a spinning frame. A short crop keeps hurting long after the decision that caused it.
USDA has tracked cotton’s slide in world fiber consumption for decades as synthetics expanded. OECD and FAO both expect demand to keep growing, only slower than the market around it. This is a fight over share, and cotton holds share the way it always has, by getting more off the same acre and being able to prove where the bale came from.
Polyester won on the numbers
Polyester took over because it solved problems mills actually have. Consistent quality, volume on demand, low cost, properties you can dial in for the end use. It runs clean through modern equipment and holds its shape. Try building a running short or a technical shell without it.
The liabilities came with the win. Most polyester is still fossil-based, and virgin output keeps outrunning the recycled kind. Textile Exchange put recycled polyester at roughly 8.9 million tonnes in 2023 and 9.3 million in 2024. Volume up, share down, because virgin grew faster.
And most of that material comes from beverage bottles rather than clothing, so what the industry has really built is a way to give a bottle a second job. The textile loop is still open.
Man-made cellulosics will take more of the mix. Viscose and lyocell get close to cotton’s hand while giving a mill more control over the fiber itself. Whether that counts as progress depends on the forest and on what leaves the wastewater plant. A handful of producers can document both. The rest would rather you didn’t ask.
Where the tariff schedule takes over
The fabric development meeting is where the duty gets set. By the time a garment reaches the port, that decision is months old.
The U.S. tariff schedule sorts apparel by construction and fiber content, and man-made fiber garments frequently carry higher base duties than the cotton equivalent. A cotton knit shirt lands around 16.5 percent. Make the same shirt in polyester and it’s 32. That gap can settle a fabric decision before anyone has costed a sample.
Free trade agreements push harder. Yarn-forward rules in USMCA and CAFTA-DR require both the yarn and the fabric to originate inside the region for a garment to enter duty free.
That creates a captive market for regional spinners, U.S. cotton yarn included. It also means that when the fabric you need isn’t made anywhere nearby, you either eat the duty or redesign the product. I’ve watched both, and neither one ever gets sorted out early.
Also Read : The U.S. Apparel Market Is Growing, But It Feels Worse Than the Numbers Say
On July 24 the United States layered additional duties of 10 or 12.5 percent on goods from 60 trading partners under Section 301, timed to the hour the temporary Section 122 tariffs expired. The grounds are forced labor enforcement. Those duties stack on MFN rates, and eligibility for a preference program doesn’t get a shipment out of them. What matters is the exemption annex, and the annex is full of fiber.
Canadian and Mexican goods moving duty free under USMCA are carved out. So are CAFTA-DR textiles. Cotton and textile tariff-rate quotas for four partners are supposed to land by September 1. Apparel duties start high to begin with. Add another tier and a supplier’s price advantage can vanish inside a quarter.
A duty on imported apparel helps a regional spinner. The same instrument applied to fiber, machinery, dyestuffs or spare parts raises the cost of the production it was meant to protect. Retaliation shows up on U.S. cotton exports. Uncertainty is expensive too, paid out in delayed commitments and orders split across more countries than anyone wants to manage.
A buyer raises cotton content because the duty on that garment is lower. Another cuts it because regional yarn costs too much or isn’t available under the origin rule. Neither decision had anything to do with what a shopper wanted or what the LCA said. The material took the cheapest lane through customs.
Sustainability meets the cost sheet
Cotton doesn’t get a pass because it grows outdoors. Its footprint depends on how the crop is irrigated and what the yield comes in at. Soil and fertilizer move it too. Global averages flatten all of that, which is convenient for the growers who deserve the least credit.
Better seed and precision application, measured in the field rather than averaged across a country. That’s where the case for cotton gets made. Brands need more to point at than a fiber category.
Polyester’s list is different. It has to get off virgin fossil feedstock and make textile-to-textile recycling work at industrial scale, with the microfiber question still sitting there unanswered. Bottle-to-fiber bought the industry time and not much else. Closing the loop takes collection, sorting, consistent feedstock, recycling capacity that runs commercially, and mills willing to buy recovered material. That’s five separate industries that have to show up at once.
Cost is where most of this comes apart. A brand publishes preferred-fiber targets in March and quietly walks them back in September when a tariff or a freight rate moves the landed price. Traceability isn’t free either. Certification and the audit trail both show up on somebody’s P&L. The companies that get anywhere write the environmental requirement into the tech pack at the front end, before the cost sheet gets signed.
Innovation and the factory floor
Chemical recycling, bio-based polymers, engineered cellulosics, protein fibers, better cotton varieties. The list gets longer every year. The hard part has never been the sample.
A fiber has to be there in quantity, every month. It needs to run on equipment a mill already owns and take dye the same way twice. Then it has to survive the cutting room, forty washes and a customer who ignores the care label. Somebody also has to commit real volume before the producer can get out of the pilot plant. Most of them won’t.
Trade policy sits on both sides of that. Duty relief on recycling equipment and inputs nobody makes here would help. Broad tariffs across product categories raise the cost of the machinery needed to build domestic capacity. You can protect an industry and make it more expensive to operate in the same afternoon.
Blends are still the wall. Cotton-poly works because it’s comfortable and cheap to make, and it’s a nightmare to separate. So the problem goes back to design. Fewer incompatible materials, and trims that come off without a knife. Durability matters here too, since nothing gets recovered if it falls apart first. And none of it counts for anything if the garment doesn’t fit or prices out of the range it was drawn for.
No winner, just choices
Cotton keeps the products where comfort matters and the shopper reads the label. Everything technical stays synthetic, and the cellulosics take whatever ground they can hold at a commercial price.
What changes is how deliberate the choice has to be. Fiber, useful life, country of manufacture, the duty attached and whether any of it can be recovered afterward. A sourcing team looking only at the mill price is reading one line of a much longer bill.
Regional production gets more attractive when the duty treatment is predictable and the origin rules are workable. Nobody’s bringing everything home. What’s changed is that factory cost alone stopped carrying the argument for long-haul sourcing. Duty exposure, inventory carrying cost and the odds of another policy change belong in the same spreadsheet.
There’s no perfect fiber coming to save anyone. Every material carries a consequence, and trade policy decides how visible it is. The real question is smaller than the one the industry keeps arguing about. Which fiber is right for this product, in this country, under the rules that apply the day the order ships, and what happens to it once the customer is finished?