The Clothes on Your Body Are Not Neutral - A Yogini's Case Against Polyester

There is a conversation in the wellness world that we have been slow to have. We talk about what we eat, what we breathe, what we put on our skin. We read ingredient labels. We swap our plastic bottles for steel. We choose organic vegetables when we can. And then we pull on a pair of polyester leggings and head to our yoga mat — completely unaware that we have just wrapped our body's largest organ in petroleum.

This blog is that conversation.

We are not here to fear-monger. We are here because the research has reached a point where it can no longer be ignored — especially for women, whose hormonal systems are particularly sensitive to the chemicals in synthetic clothing. At Yogini, we believe that a truly holistic life — one that honours the body, the breath, and the earth — has to include what we wear.

So let us go through it. Honestly. With the science.

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## First, let's acknowledge the appeal

We understand why polyester dominates your wardrobe. It is affordable. It is durable. It wicks sweat. It does not crease. A synthetic legging fits like a second skin and survives a hundred washes without fading. Fast fashion has made it the default fabric of the modern woman.

And the yoga and activewear industry, in particular, has built an entire economy on the promise that synthetic fabric performs better than natural alternatives.

We are not here to pretend none of this is true.

But "comfortable" and "safe" are not the same thing. And what this fabric is doing inside your body — and to the planet — is a story the marketing has consistently left out.

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## What polyester actually is

Polyester, formally known as polyethylene terephthalate (PET), is a plastic. The same plastic used to make water bottles. It is a synthetic petroleum-based fibre, derived from PET — the same plastic used in water bottles. The production process involves extracting crude oil from the earth, refining it into petroleum, converting petroleum into polyester polymers, and then extruding these polymers into fibres.

This is not a fabric the earth made. It is a fabric a petrochemical process made. And wearing it against your skin for 12 to 16 hours a day — pressed against your largest organ — has consequences that science is only now beginning to fully document.

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## The microplastic problem — and why it matters for women

Every time you wear polyester, and every time you wash it, it sheds. A single laundry load of polyester clothes can discharge as many as 700,000 microplastic fibres. Shedding of microplastics is not limited to washing; synthetic clothing releases microplastics throughout its entire lifecycle, from manufacturing to wear and disposal.

These fibres — invisible to the eye — travel into the air, into waterways, into the food chain, and into your body.

The scientific community has been tracking where these particles end up. The findings, published in major peer-reviewed journals over the past two years, are not easy reading.

In 2024, researchers at the University of New Mexico found microplastics in every single human testis sample they examined — 23 samples in total — at concentrations nearly three times higher than those found in human placentas. Polyethylene terephthalate (PET) — the specific plastic used to make polyester fabric — was consistently among the polymers detected.

In March 2024, a landmark study published in The New England Journal of Medicine examined arterial plaque removed from 304 patients. More than half contained detectable microplastics. Patients whose plaque contained microplastics had a 4.5 times higher risk of heart attack, stroke, or death over a 34-month follow-up period compared to those whose plaque did not contain microplastics.

Microplastics have also been found in breast milk, in human placentas, and in the blood of newborns. Microplastics make their way from the gut to other organs.

For women — who are already navigating the hormonal complexity of menstrual cycles, fertility, pregnancy, perimenopause — this is not abstract. This is about what is circulating in the very systems that govern our wellbeing.

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## The hormone disruption connection

Here is where the argument becomes specific to women's health — and where we at Yogini feel the most urgency to speak.

Polyester clothing does not just shed microplastics. Laboratory analysis reveals polyester often contains: Antimony — used in 80–85% of polyester manufacturing and which mimics estrogenic activity; BPA — found at up to 19 times safety limits in some polyester garments; Phthalates — above safe thresholds in 20% of fast-fashion items; and PFAS — detected in 65% of children's synthetic clothing.

These are not fringe concerns. The Endocrine Society links these chemicals to metabolic disorders, and the WHO confirms these chemicals migrate into water during washing.

Endocrine disruptors — chemicals that mimic or interfere with your body's natural hormones — are particularly dangerous for women managing conditions like PCOS, thyroid disorders, endometriosis, and fertility challenges. When you wear a synthetic fabric pressed against your skin for hours each day, and your skin is absorbing those chemicals, you are adding to an already demanding hormonal burden.

A study found that men wearing polyester underwear exhibited reduced sperm count and motility, with some developing azoospermia after 139 days; these effects reversed after switching to cotton. If polyester has a measurable impact on male reproductive health in under five months, we should ask what continuous daily exposure is doing to the far more hormonally complex female system.

Organic cotton does not have harmful chemicals that can affect your hormones. It is free from endocrine disruptors and other dangerous substances. For women who are already working hard to balance their hormones through yoga, nutrition, and lifestyle — choosing organic clothing is not a luxury. It is consistent with everything else you are doing.

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## Your skin is absorbing what you wear

Your skin is not a wall. It is a permeable, living organ — the body's largest. What sits on it, and particularly what sits on it in warm, damp, post-sweat conditions (like after a yoga class), has a documented capacity to be absorbed.

Since polyester is not breathable, sweat becomes trapped between the material and your skin. This creates a damp environment where bacteria thrive. Some people may also develop an allergy or sensitivity to polyester, which can cause rashes, irritation, or itchiness.

Research published in Contact Dermatitis as far back as the 1990s linked synthetic fibres to skin irritation and allergic reactions — and subsequent studies have continued to document this connection. The skin microbiome — the diverse community of bacteria that protects your skin and immune health — is disrupted by synthetic fabrics, which alter the moisture and chemical environment against the skin.

From everyday irritation to long-term skin concerns, your clothing can either support your skin's natural balance or disrupt it.

For women with eczema, psoriasis, hormonal acne, or sensitive skin — fabric choice is not cosmetic. It is clinical.

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## The "recycled polyester" loophole

Perhaps you have switched to activewear that advertises itself as made from recycled plastic bottles. You feel good about this choice. We understand — and the intention behind it matters.

But recycled polyester is not the solution it claims to be. A 2024 study published in PubMed found BPA levels almost twice as high in recycled fabrics compared to conventional polyester (13.5 vs 7.7 ng/g). Recycled polyester garments released 55% more microplastic pollution particles during a single laundry cycle. The fibres from recycled cloth were also approximately 20% smaller in diameter — and smaller fibres can penetrate filters and human tissues more easily.

Recycling the plastic does not remove its properties. It may concentrate them.

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## What about the planet — and why that affects us too

We cannot have this conversation without acknowledging that what harms the planet eventually harms us. The two are not separate questions.

Research estimates that synthetic textiles are responsible for 35% of the microplastics in our oceans today. In 2024, scientists estimated that there are 51 trillion microplastic particles in our oceans.

Polyester alone produces two to three times the carbon emissions of cotton during production. The fashion industry is responsible for 10% of the world's carbon emissions — more than all international flights and maritime shipping combined.

And unlike natural fibres, polyester does not return to the earth. These microplastics persist for centuries, creating a legacy of pollution that will outlive us all.

In yoga philosophy, we speak of ahimsa — non-harm. The principle extends beyond our relationships with other people. It extends to the earth, to other living beings, and, we would argue, to ourselves. Choosing clothes that shed plastic into rivers and accumulate in our organs is not a neutral act.

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## So what should you wear?

We want to be practical here, not preachy. Here is what the evidence supports:

*Organic cotton* is the gold standard. Organic cotton is free from formaldehyde, PFAS, and synthetic dyes, which reduces dermal and respiratory exposure. Its breathability minimises irritation, benefiting sensitive skin. Organic cotton uses 71% less water and 62% less energy than conventional cotton, with a 46% lower global warming potential than polyester. It biodegrades within months, avoiding landfill accumulation.

*Linen* is excellent for warm climates and is one of the most durable, breathable natural fabrics available. It is particularly good for yoga because it softens with use and regulates body temperature naturally.

*Bamboo* (where the processing is certified and low-chemical) offers softness comparable to synthetic fabrics without the endocrine-disrupting chemistry.

*Khadi* and *handloom cotton*, for our Indian readers, are deeply aligned with both health and cultural values — breathable, chemical-light, and supporting local artisans.

Look for these certifications when shopping:

- *GOTS (Global Organic Textile Standard)* — the most rigorous organic textile certification

- *OEKO-TEX Standard 100* — certifies that the fabric is free from harmful substances

- *Fair Trade* — ensures ethical labour alongside environmental standards

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## The honest counterargument

We will acknowledge what the other side says, because intellectual honesty matters to us.

Some researchers caution that the level and duration of exposure significantly influences the risk of any adverse health outcome. In the case of polyester, the typical consumer exposure through clothing is minimal, with most studies indicating no direct causal relationship between polyester fabric wear and cancer development.

This is a fair point. We are not claiming that wearing one polyester top will harm you. We are saying that wearing synthetic fabrics against your skin daily, for years, in the context of an environment already saturated with microplastics, adds meaningfully to a cumulative burden — one that the most recent science is increasingly finding in human tissue.

The precautionary principle applies here. When the evidence suggests harm and the alternative is available, accessible, and often not dramatically more expensive than premium synthetics — choosing differently is the logical move.

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## A note on cost

We hear this concern, and it is valid. Organic clothing costs more than fast fashion. This is a real barrier for many women, and we do not dismiss it.

A few thoughts:

*Buy less, choose better.* A wardrobe of 10 well-made organic cotton pieces that last five years is more economical — and less polluting — than 40 synthetic fast fashion pieces replaced annually.

*Start with what touches you most.* If a full wardrobe change is not possible, prioritise the garments closest to your skin: underwear, sleepwear, yoga wear. These have the longest daily contact with your most absorbent and sensitive skin.

*Second-hand natural fibres* are an excellent middle path. A vintage cotton kurta or a pre-loved linen shirt has no new environmental cost, very little residual chemical load, and costs a fraction of new organic clothing.

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## The yogini's wardrobe

Here is what we practise ourselves at Yogini, and what we recommend:

For *yoga practice* — loose-fit organic cotton or linen. It breathes. It moves. It absorbs sweat without trapping it against your skin. Yes, it may cling slightly in a headstand. We consider this a fair trade.

For *everyday wear* — organic cotton kurtas, linen sets, handloom weaves. The closer to the skin, the more deliberately we choose.

For *sleep* — 100% cotton. The night is when your body detoxes and repairs. What it lies against for eight hours matters.

The women who have practised yoga the longest — the women whose traditions we draw from — wore cotton and natural fibres. Not because they lacked alternatives, but because they understood that the body is not separate from its environment. What surrounds you enters you.

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## Closing thought

In yoga, we speak often of saucha — purity or cleanliness. It is one of the Niyamas, the personal observances of yogic life. Saucha is usually interpreted as hygiene of the body and mind. But it can extend further: to the purity of what we consume, what we breathe, what we wear.

Living a yogic life is not just about what happens on the mat. It is about the accumulated choices that either support or deplete the body's intelligence. The clothes we wear are one of those choices — quiet, daily, and more consequential than most of us have been told.

At Yogini, we believe that a body tended with care — in movement, in breath, and in what it wears — is a body that can truly thrive.

Start where you are. Change one thing. Your skin will notice. Your hormones will notice. And the earth, quietly, will too.

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Written with care by the Yogini team.

yogini.co.in | connect@yogini.co.in | @yogini.co.in

This blog is for educational purposes. It is not medical advice. Please consult a healthcare professional for any health concerns.