Mulmul to Mill Cotton: India's Pyjama Fabric Heritage

By the Pink Elephant Sourcing Team — reviewed by our fabric lead.

Pyjama is one of the few English words the world borrowed straight from India. Most people wearing the garment today don't know that. Somewhere between the Mughal courts and a British officer's steamer trunk, the loose cotton drawstring trouser known in Hindi and Urdu as pāy-jāma ("leg garment") left the subcontinent. The English spelling "pyjama" appeared in the early 1800s. Decades later the garment came back to India as a mass-market Western sleepwear item, stitched in mills its own name never mentions. At Pink Elephant, we think that's worth fixing. This piece covers where Indian sleepwear fabric actually comes from. It covers why Indian-milled cotton behaves differently on an Indian night than an imported synthetic blend. And it covers how to read a fabric label well enough to buy well, from us or anyone else.

A Word That Traveled Out of India and Back

The Oxford English Dictionary traces "pyjama" to around 1800. British and Portuguese traders borrowed it from Persian pāy (leg) and jāma (garment) via Hindustani. The garment itself is much older. Loose drawstring trousers were everyday wear across North India, Persia and Central Asia centuries before any European trading company arrived. What changed back then wasn't the garment. It was who wore it. British residents in India picked up the pyjama as cool, easy sleepwear. They carried it home when they left. By the late 1870s it had replaced the nightshirt in fashionable British bedrooms. By the early 1900s it had crossed the Atlantic into American department stores.

That history matters here for one simple reason. The fabric traditions that made pyjamas comfortable in the first place were Indian traditions, built for Indian heat and humidity, decades before the garment had an English name. The West inherited the silhouette. It rarely inherited the fabric logic behind it.

The Traditional Fabrics: Mulmul, Voile, Cambric and Khadi

Walk into any old-city textile market in Lucknow, Dhaka or Chennai and you'll hear four fabric names used almost interchangeably. Shoppers treat them as synonyms. They aren't. Each behaves differently against skin over a season of actual use.

Mulmul (Muslin)

Mulmul is a plain-weave cotton woven from very fine, high-count yarn. The best 18th-century Bengal muslin was so fine European traders called it "woven air." Modern commercial mulmul rarely reaches those historic counts. Even at a practical 60–100 threads per inch, it stays sheer, airy and soft from the first wash. The trade-off is durability. Mulmul softens fast but also wears thin faster than a heavier weave, especially under high dryer heat.

Cotton Voile

Voile uses a tightly twisted yarn in a slightly more open weave than mulmul. New voile has a crisp hand and a faint, almost papery drape. It's the fabric behind most "lightweight summer" pyjama sets sold in India, because it breathes well without feeling as fragile as true mulmul.

Cambric

Cambric is a closer, denser plain weave — still cotton, but built to hold its shape and resist pilling better than voile or mulmul. Brands reach for cambric when they want a pyjama that looks crisp on a hanger and survives repeated washing without going limp. The cost is breathability. Cambric runs warmer than voile in genuinely humid weather.

Khadi

Khadi is hand-spun, hand-woven cotton or silk, historically tied to India's independence-era push for self-reliant textile production. Hand-spinning produces small yarn irregularities that machine spinning smooths away. That irregularity is exactly what gives khadi its characteristic slightly uneven, breathable texture. It's slower and costlier to produce. Retail reflects that: a khadi pyjama set typically runs ₹1,200–₹2,500, against ₹600–₹900 for a mill-cotton equivalent.

Where It's Actually Milled

Most shoppers never ask where their "cotton" pyjamas were actually woven. The label rarely says. India is one of the world's largest cotton producers by acreage, according to the Ministry of Textiles, Government of India (texmin.gov.in). That scale shows up in two concentrated manufacturing belts most Indian sleepwear brands draw from, including smaller independent labels. Tamil Nadu's Tiruppur-Erode-Coimbatore belt is India's largest knitwear and cotton-processing cluster, built on decades of spinning, dyeing and knitting infrastructure. Gujarat's Ahmedabad-Surat corridor is the country's other major cotton and woven-fabric hub, with roots in composite milling going back to the 19th century.

We source finished cotton fabric from mills in this general belt and have every batch inspected before cutting. We don't claim a single named-mill origin story. An honest cotton supply chain usually runs through more than one processing step — ginning, spinning, weaving or knitting, then dyeing and finishing — before a garment ever reaches a cutting table. Naming one facility as "the" source would overstate what we can verify end to end. What we can verify, because we test it ourselves, is the finished fabric's actual behaviour: weight, shrinkage after three washes, and colour retention after six months of normal wear.

Dyeing and Finishing: The Step Most Shoppers Never Think About

Weaving the cloth is only half the job. What happens after weaving decides a lot of how a pyjama set will actually feel and wash. Grey, undyed cotton fabric comes off the loom stiff and slightly waxy, because the natural cotton wax hasn't been removed yet. A process house then bleaches or scours it, dyes or prints it, and finishes it with heat and sometimes a light starch or softening agent before it ever reaches a cutting table.

That finishing step matters for two reasons most buyers never see on a label. First, over-processed fabric can feel soft in the store and then lose that hand after two or three washes, because the softness was a surface finish, not the yarn itself. Second, dye quality decides whether colours hold. Reactive dyes bond into the cotton fibre and tend to wash well for years; cheaper direct dyes sit more on the surface and fade faster, especially in dark colours washed in hot water.

We ask our fabric partners for reactive-dyed cotton wherever the colour allows it, and we build colour-fastness into the same three-wash test we run for shrinkage. A set that bleeds or visibly fades in that test doesn't go into production, no matter how good the swatch looked on day one. We found this check catches roughly one in six new colourways before it ever reaches a customer, which is a simple, data-backed reason this step is worth the extra week it adds to our fabric approval process.

Reading a Label: Thread Count vs GSM vs Weave

Three numbers show up on sleepwear labels. Most shoppers treat them as interchangeable. They each measure something different.

• Thread count (threads per square inch) matters most for bedsheets, where a tight, dense weave is the whole point. For garment fabric it's a weak predictor of comfort on its own. A high-thread-count voile can still feel papery if the yarn itself is coarse.
• GSM (grams per square metre) is the number that actually predicts how sleepwear will feel and drape. Lightweight summer pyjama fabric typically runs 100–140 GSM. A cosier cotton flannel for cooler weather runs 160–200+ GSM. If you check only one number before buying, check GSM against the season you're buying for.
• Weave (plain, twill, satin) shapes texture and sheen more than either number. Plain-weave cotton — mulmul, voile, cambric — is matte and breathable. Satin weave, even in 100% cotton, traps more heat against skin because the construction is denser and the surface reflects more than it absorbs.

Our own rule of thumb, built from testing finished garments rather than loose swatches: for an Indian summer night, look for 100–140 GSM plain-weave cotton first. Check thread count only after that.

Why Indian-Milled Cotton Fits Indian Humidity

This is the part most sleepwear marketing skips. It's a materials-science point, not a styling one. Cotton is hygroscopic. It absorbs and releases moisture vapour from the air and from skin — a property textile scientists call moisture regain. Cotton's moisture regain sits at roughly 7–8.5% under standard testing conditions. Polyester's sits at roughly 0.4%. Those figures are documented in standard fibre-property references, including the overview maintained at Wikipedia's cotton fibre entry, which collates the ASTM-referenced regain numbers used across the textile industry.

In practice, that gap is why a cotton pyjama feels cooler on a humid June night in Chennai or Mumbai than a polyester-cotton blend at the same GSM. The cotton actively pulls moisture away from skin and releases it into the air. The synthetic fibre mostly sits on the surface, trapping the humidity your body is trying to shed. Synthetic blends have their place — they resist wrinkling and dry faster on a clothesline. But for next-to-skin sleepwear in the climate most of our customers sleep in, that trade-off usually isn't worth it.

How We Select and Test Our Fabric

We don't take a mill's spec sheet at face value. Our methodology, in short: every new fabric batch goes through an internal three-wash test before we approve it for a production run. We wash a cut swatch three times at the temperature printed on our care label, then measure shrinkage and check for colour bleed and pilling. We measured shrinkage across our last twelve fabric batches and rejected two of them outright for shrinking more than 5% after the third wash — well above what we consider acceptable in a garment meant to fit the same way for years.

We also track customer-return reasons by fabric batch. When we found one voile batch returning more "feels thin" comments than our baseline, we pulled the remaining stock and re-tested the weight. It came in under spec. That's the kind of signal a mill's own spec sheet won't give you, and only our own return data surfaced it.

Our team's general rule, built from that testing rather than from any single supplier's claim, is to favour mid-weight plain weaves — 120–140 GSM — over the lightest mulmul for everyday sets. We reserve true fine mulmul for occasion pieces, where the softer, more delicate hand is the point rather than a durability compromise.

Sizing Across Weaves

One detail that rarely makes it onto a product page: different weaves shrink and relax at different rates, which changes how you should size them. In our own testing, voile and cambric lose roughly 2–4% in each direction after the first three washes and then stabilise. Mulmul can lose slightly more in the first wash alone, because the fine, loosely twisted yarn relaxes faster. Khadi, by contrast, is often pre-washed by the weaving unit before it reaches a cutting table, so it tends to hold its stated measurements more consistently from day one. Our practical advice: if a size falls between two options on a mulmul or voile set, size up rather than down, and expect the fit to settle — not loosen further — after the third wash.

Caring for Indian Cotton So It Stays Soft

Two habits ruin good cotton sleepwear faster than normal wear ever will.

1. Washing too hot. Cotton fibres relax and the weave loosens with repeated hot-water washing. Stick to cold or lukewarm water, 30°C or below, and the fabric holds its weight and hand for years instead of months.
2. High-heat tumble drying. Heat also accelerates fibre breakdown and colour fade. Air-dry in shade, or use the lowest dryer setting, and a cotton set that would otherwise thin out within 90 days can comfortably last several seasons.

Beyond that: wash similar colours together for the first few cycles, since natural dyes used on khadi and some handloom cotton can bleed slightly early on. Use a mild detergent rather than a harsh whitening powder. And skip fabric softener on anything you bought specifically for its breathability — softener coats the fibre and reduces exactly the moisture-wicking behaviour that made the cotton worth choosing in the first place.

Frequently Asked Questions

What's the difference between mulmul and cotton voile for sleepwear?

Mulmul is a finer, sheerer weave that softens fastest but wears thinner over time. Voile is a slightly denser, crisper weave that holds up to regular washing while still breathing well. For everyday pyjamas, voile or a mid-weight plain weave generally outlasts true mulmul.

Is higher thread count always better for pyjamas?

No. Thread count predicts weave density, not comfort on its own. GSM and weave type — plain versus satin — are better predictors of how a sleepwear fabric will actually feel and breathe.

Why does Indian cotton feel cooler than polyester-blend pyjamas?

Cotton's moisture regain, its ability to absorb and release humidity, sits around 7–8.5%, compared with roughly 0.4% for polyester. That difference is why cotton actively pulls moisture away from skin in humid conditions, where synthetic blends tend to trap it instead.

What GSM should I look for in summer sleepwear?

We recommend 100–140 GSM plain-weave cotton for hot, humid nights. Heavier cotton flannel, 160 GSM and up, suits cooler weather better.

How do I stop my cotton pyjamas from thinning out?

Wash cold or lukewarm, 30°C or below, skip the tumble dryer's high heat setting, and avoid fabric softener, which coats the fibre and blunts its breathability over time.

Is khadi worth the extra cost for sleepwear?

If you want the most breathable, slightly textured hand-woven option, yes. Khadi typically costs ₹1,200–₹2,500 per set against ₹600–₹900 for mill-cotton equivalents, reflecting the slower hand-spinning and hand-weaving process behind it.

Should I size up when buying mulmul or voile pyjamas?

Generally yes, if you're between two sizes. Our own testing shows voile and cambric lose roughly 2–4% in each direction after the first three washes, and mulmul can lose slightly more in the very first wash. Sizing up gives you room for that early settling.

Where to See This in Practice

If you want to see this sourcing logic applied rather than just explained, browse our pyjama and pyjama set collection. Every set lists its GSM and weave on the product page, not just "100% cotton." For a narrower seasonal comparison, our earlier piece on cotton vs synthetic nightwear for Indian summers goes deeper on that specific trade-off. You can also browse our pyjama sets directly, see current favourites in bestsellers, or read more about how Pink Elephant sources and tests fabric on our About Us page.