Every so often a fabric conversation starts on the internet and it is hard to tell whether anything real is underneath it. Someone posts a video about polyester, the comments fill up, and a week later it has moved on.
So I went looking for people who are not posting about it. People who handle fabric professionally, all day, as the actual work. Stylists, costume designers, creative directors, the ones who put clothes on other people for a living and have to answer for how those clothes behave under lights, over long days, on skin that is not their own.
They have been drifting away from polyester for a while now. Not loudly, and not as a trend. Mostly because they are the ones who notice first.
The Stylist Who Built a Brand Around It
The clearest example I found is Tallulah Harlech, an English stylist who grew up inside London's fashion world. Her mother is Amanda Harlech, which is about as close to the center of that world as it is possible to be.
She has also had guttate psoriasis since she was nine. In an interview with the South China Morning Post this summer, she described what most of us never have to think about, which is clothing as a genuine source of anxiety. Her condition is inflammatory enough that she spent over a decade on immunosuppressant medication, and for much of her life she was permitted to wear oversized cotton and not much else. A polyester top on a night out could set her skin back for weeks.
In 2024 she launched Sylva, a London brand built on certified natural performance materials including cellulose, eucalyptus, and seaweed. Polyester is banned outright.
What struck me was how she explained the thinking. "The beauty industry was surging forwards with all sorts of multi-step treatments and protocols for skin health, but they didn't really go further down the body than the neck," she told the paper. "How could I choose a fabrication that was more sympathetic to its largest organ: the skin?"
That question is the whole thing, really. We have collectively accepted that what we put on our faces matters enormously and what we put on the other ninety percent of us is a styling decision.
What the Industry Veterans Say
Harlech has a personal stake, so it would be fair to ask whether she is an outlier. She is not.
Caroline Belhumeur, creative director at Vince, described what natural fiber customers are after in a way I have not been able to improve on since I read it. They want clothes that are breathable, durable, and that "feel beautiful on the skin and often transcend seasons."
Michael Palladino, a fashion industry veteran who now lectures at Kingsborough Community College, told NPR earlier this year that his students are shifting the same direction. His summary of why is one sentence long and worth taping to a mirror. "It might have cost you a little more, but you're going to have it longer. You're going to cherish it, and I think that's the word people have to start thinking about."
Cherish. A word about attachment to your own things, which is not how any of us talk about a garment we expect to fall apart.
And Henry Navarro Delgado, who teaches at Toronto Metropolitan University's school of fashion, made a point in the same piece that reframed the problem for me entirely. Polyester is not universally bad. Polyester is constantly used for jobs it is bad at. It turns up in summer clothing even though the material traps heat. "When you don't have access to a product that is effectively designed for its purpose, then you don't use it. You discard it," he said.
That is not a moral argument. It is a design argument, and it is much harder to wave away.
What We Actually Know
In March, Netflix released The Plastic Detox. It follows six couples with unexplained infertility through ninety days of pulling plastic out of their lives, guided by Dr. Shanna Swan, the environmental epidemiologist who has spent her career documenting falling sperm counts. Clothing was part of it. Polyester, nylon, and spandex out. Cotton and wool in.
Their chemical biomarkers dropped. Some fertility markers improved. Three of the six couples got pregnant.
Judith Enck, the president of Beyond Plastics and a former EPA regional administrator, watched the film and said she did not find one factual mistake in it.
I want to be precise about what that does and does not establish, because the precision is what makes it land rather than what softens it. Those couples changed many things at once, including fragrances and personal care products, which are one of the heaviest sources of phthalates there is. One of the microplastics scientists who praised the film said it should honestly have been called the PFAS and Phthalates Detox. A reproductive endocrinologist asked about it said there is still no clear evidence establishing a direct causal link with infertility. All of that is true alongside Enck's assessment, not instead of it.
Here is what is not in dispute. Microplastics have been documented in peer-reviewed studies in human lungs, blood, brain, placenta, and testicles. Plastics carry chemicals, and some of those chemicals are known endocrine disruptors. Polyester is plastic. It sheds, and it sheds more the longer you wear it and every time you wash it.
What we do not have yet is the study that closes the loop from your pajamas to your hormones. Researchers are still largely mapping where these particles end up before they can say what they do once they are there.
So I am not going to tell you your pajamas are making you infertile. Nobody can say that yet, and I am not willing to sell you something on a fear I cannot support.
What I will tell you is this. The evidence has been moving in one direction for a decade and has not once turned around and pointed back toward plastic being fine. When the science is still arriving and the thing at stake is your endocrine system, I do not think you are required to wait for certainty about the one garment you wear against your skin for eight hours a night. That is not alarmism. That is how sensible people handle an open question that has an easy answer.
And I want to say the other half of this plainly, because I have watched this conversation turn cruel. If your budget this month says twelve dollar top, buy the twelve dollar top. None of this is a character test. I am not interested in a version of this where a woman feels guilty about what she can afford.
Why the Professionals Notice First
There is a reason this shift shows up among stylists and costume designers before it shows up anywhere else.
They see garments across time in a way the rest of us do not. A costume has to survive a shoot. A styled look has to hold up through a long day under warm lights on someone who cannot fidget. A creative director watches a fabric come back from wear tests. They are running the experiment that most of us run accidentally and slowly, over years, one disappointing sweater at a time.
They also touch a lot of fabric. When you have handled thousands of garments, the difference between a fiber that breathes and one that does not stops being an abstraction and becomes something your hands know immediately.
The rest of us are getting there through a slower route, which is buying something, liking it, washing it four times, and watching it turn into a different object.
What This Means at the Rack
You do not need industry credentials to use any of this. You need the sewn-in tag and about thirty seconds.
Match the fiber to the job. This is Navarro Delgado's point applied to your own closet. Polyester earns its place in rain shells, technical athletic wear, and anything that has to survive a hot wash without ceremony. It is a poor choice for hot weather and a poor choice for eight hours pressed against your skin overnight. Right tool, wrong place.
Read the composition, not the adjective. "Silky," "luxe," and "cooling" are not fiber names. The sewn-in tag has to tell you the truth about what the fabric is. Everything on the front of the package is describing how it looks.
Start with what touches you longest. If you are going to change one category, change the one with the most contact hours. That is sleepwear and underwear, not your coat.
Use the cherish test. Palladino's word is a better filter than any certification. Will you still want this in three years, and will it still be worth wanting? A half-polyester sweater, in his words, will look hideous in three.
Where We Sit
I should be straightforward about our own position, since I have just spent a thousand words quoting people who happen to agree with us.
MoonThreads makes silk and cotton sleepwear. Our night dress is 19 momme and our robe is 22 momme, both 100 percent 6A grade mulberry silk, certified to OEKO-TEX Standard 100. Our cotton set is made with GOTS-certified organic cotton. None of the people quoted above have anything to do with us, have any opinion about us, and would not know our name. I am quoting them because they said something true in public, not because they endorsed anything.
We chose natural fibers for the same reason they did, and for one more. For the specific job of sleeping, natural fibers do the work better. And for the eight hours a night when something is against your skin without interruption, I would rather it not be plastic while the science is still coming in.
The Short Version
The people who handle fabric professionally have been moving away from polyester for years. It traps heat. It irritates skin. It ages badly. It gets used constantly for jobs it was never suited to.
And underneath the comfort argument there is a second one that is harder to dismiss every year. Polyester is plastic, plastic sheds, and we are finding those particles in places inside the human body that nobody expected to find them. Causation is not settled. The direction of travel is.
You do not need permission or proof to want the thing you sleep in to be made of something that grew.
By Ann Havenly
MoonThreads makes sleepwear from GOTS-certified organic cotton and OEKO-TEX Standard 100 certified 100% 6A grade mulberry silk. Certificate numbers available on request.