Why Not Polyester?
Textile 101 — notes from a manufacturer. I've spent my working life inside processing mills and fabric units, so let me answer a question I get asked constantly: "What's actually wrong with polyester?"
Start with what polyester is
Polyester is plastic. Not "like" plastic — it literally is one. PET, the same polymer family as the soft-drink bottle, drawn into fine filaments and woven or knitted into cloth. That single fact explains almost everything else about how it behaves on your body.
To be fair to it: polyester is strong, cheap, wrinkle-resistant and easy to mass-produce. That's why fast fashion loves it. But a fabric that is good for a factory's costing sheet is not automatically good on your skin — especially not in our weather.
The problem: it doesn't breathe
Cotton is a natural cellulose fibre. Its structure actually absorbs moisture — under standard conditions cotton holds around 8% of its weight in moisture, which is why a cotton kurta feels dry even when you're perspiring. Polyester absorbs almost nothing — well under 1%. Sweat has nowhere to go. It sits on your skin as a film, and the garment sits on top of that film.
That is the clammy, sticky feeling you get in a polyester shirt by mid-morning. The fabric isn't wet — you are, and the fabric refuses to help.
Now add Indian weather
Most of India lives between 30 and 40°C for a good part of the year, and along the coasts you can add serious humidity on top. Your body's only cooling system is evaporation of sweat. For that system to work, the fabric on your skin must do two jobs: pull moisture away, and let air move through.
Cotton does both. Polyester does neither well. In Mumbai humidity, a polyester shirt becomes a personal greenhouse — heat and moisture trapped in a thin plastic tent you're wearing. This is why the same polyester dress that looks fine in an air-conditioned mall becomes unbearable on the local train.
The odour problem nobody talks about
Body odour isn't sweat — it's bacteria feeding on sweat. Because polyester holds sweat on the surface and doesn't wash out oils easily, it gives those bacteria a comfortable home. Ask anyone who owns polyester gym wear: the smell comes back the moment you warm up, even after a wash. Cotton, which absorbs and releases moisture and washes clean at high temperatures, simply doesn't build up odour the same way.
Static, cling and the skin
Polyester builds static charge in dry weather — the crackle when you pull off a jumper, the kameez that clings in the wrong places. And for sensitive skin, a non-breathing synthetic layer that traps heat and sweat is a common trigger for prickly heat and rashes, particularly for children and anyone who spends the day outdoors.
Where polyester honestly makes sense
I'm a manufacturer, not a purist, so let me be fair. Polyester earns its place in a few jobs: rain shells and windcheaters, where you want a barrier; activewear engineered to wick (a specific knit construction, not ordinary polyester cloth); linings, umbrellas, bags, upholstery. And a small polyester content in a cotton-rich blend can add crease recovery for formalwear. Used deliberately, it's a useful fibre. Used as a cheap substitute for everyday clothing in a hot country, it's the wrong tool for the job.
Why cotton just works
Cotton breathes — air passes through the fabric and across your skin. It absorbs sweat and releases it to the air, which is exactly how your body wants to cool itself. It feels better against skin, doesn't cling, doesn't crackle, doesn't hold on to odour. It handles the Indian bucket-wash-and-sun-dry routine happily, and it actually gets softer with age instead of pilling into little plastic beads.
There's a reason every garment our grandparents trusted in this climate — the kurta, the saree blouse, the bedsheet, the baby's clothes — was cotton. That wasn't nostalgia. It was engineering by experience: centuries of trial and error in exactly the heat and humidity we still live in.
The simple rule I give friends
For anything worn against your skin, for long hours, in Indian weather — choose cotton or a cotton-rich fabric, and save polyester for the jobs where a plastic barrier is actually the point. Check the label: "100% cotton" means what it says. If it says "polyester" or just "imported fabric" with no composition, you now know exactly what you're getting into — and what will be sticking to you by lunchtime.
Shop cotton that's built for this weather
Cotton · Shirts · Dresses · Co-ord Sets · Cotton Satin
— Sameer Agarwala is a textile manufacturing expert who has set up and runs integrated fabric processing mills, and works with legacy textile brands. This is part of his Textile 101 series — plain-English notes on how fabric really works.
