What Natural Fibres Actually Means

You've learned to check the label. Most women who care have.

So you check, and it says 100% cotton, and you buy it — and three weeks later something about it feels wrong. The lining sticks in a way cotton doesn't. The waistband holds a crease it shouldn't. The pockets feel like a carrier bag.

You weren't imagining it, and the label wasn't lying. It just wasn't describing the whole garment.

Here's what natural fibres actually are, where the confusing middle sits, and what a composition label is and isn't required to tell you.

The short answer

A natural fibre is one that comes out of a plant or an animal in fibre form and is spun into yarn. It's grown, not made in a reactor.

Plant fibres: cotton, linen, hemp, jute, ramie Animal fibres: wool, silk, cashmere, alpaca, mohair, camel

Synthetic fibres — polyester, nylon (polyamide), acrylic, elastane — are made from petrochemicals. They didn't grow.

Between the two sits a third group that causes most of the confusion, and most of the marketing.

Plant fibres

Cotton — the most common natural fibre in clothing. Soft, breathable, takes dye well, gets better with washing. Quality varies enormously with staple length; long-staple cotton makes a smoother, stronger, longer-lasting cloth than short.

Linen — from flax. Stronger than cotton, more breathable, and it creases, which is the entire point and also the thing people complain about. Softens over years rather than wearing out.

Hemp — closest relative to linen in behaviour. Durable, coarse when new, softens considerably.

Ramie and jute — less common in clothing. Usually blended.

Animal fibres

Wool — insulates when damp, resists odour, holds its shape. Merino is finer and softer than standard wool; lambswool comes from the first shearing.

Silk — a protein filament, not a plant fibre. Drapes in a way nothing synthetic manages to copy, which is why so many things try.

Cashmere, alpaca, mohair — finer, warmer, more expensive per gram. Cashmere quality varies more than almost any other fibre on the market; the word alone tells you very little.

The confusing middle: viscose, modal, lyocell, bamboo

This is where most of the mislabelling lives.

Viscose (also sold as rayon), modal, lyocell, Tencel and "bamboo" fabric are regenerated cellulosics — sometimes called man-made cellulosic fibres. They start as plant material, usually wood pulp. Then that pulp is dissolved chemically and extruded into a new fibre.

So: plant-derived, yes. Natural in the sense of a fibre that grew and was spun? No. The plant was taken apart and rebuilt.

They aren't synthetic either. They're a third category, and they behave like one — breathable and soft like a natural fibre, but weaker when wet and often shorter-lived.

Bamboo deserves a specific warning. Almost all fabric sold as "bamboo" is viscose made from bamboo pulp. It is not bamboo the way linen is flax. If a label says bamboo without saying viscose, that's a marketing choice, not a fibre.

Lyocell and Tencel are made in a closed-loop process that recovers most of the solvent, which makes them a better-made version of the same category. Still not a natural fibre.

Where Elunne stands on this: we don't use them, and we don't pretend the distinction is dramatic. They're simply not what we're building with.

What's actually synthetic

Polyester — plastic. The most common fibre in clothing worldwide. Nylon / polyamide — plastic. Acrylic — plastic, usually standing in for wool. Elastane / spandex / Lycra — plastic. All three words mean the same fibre; in the EU only "elastane" is the legal fibre name, and brand names like Lycra can only appear alongside it, never instead of it.

Two naming games worth knowing:

"Recycled polyester" is still polyester. Better sourcing, identical fibre. "Vegan silk," "vegan leather," "plant-based fibre" are marketing phrases with no fixed meaning. Look for the fibre name.

Why the label isn't the whole garment

This is the part almost nobody explains, and it's the reason the "100% cotton" trousers still felt wrong.

In the EU, textile composition labelling runs on Regulation 1007/2011. It's a good regulation. It's also narrower than most people assume.

Multi-component garments. If a garment has several components with different fibre contents, each component's content has to be declared — unless the component isn't a main lining and makes up less than 30% of the garment's total weight. Under that threshold, it doesn't have to appear on the label at all.

Decorative fibres. Visible, separable fibres that are purely decorative and account for under 7% of the finished weight don't have to be counted in the composition either.

Put those together and here is what can legally sit inside a garment labelled 100% cotton: polyester pocket bags. A part-lining that isn't the main lining. Fused interfacing in the waistband and collar. Polyester thread throughout. Elastic in the cuffs. Trims.

None of that is fraud. It's the regulation working as written. But it does mean the number on the label describes the main fabric, and the main fabric is not the same thing as the garment.

Two other things worth knowing while you're reading labels: 1007/2011 governs fibre names and composition only. Care instructions and country of origin aren't required by it at all — brands include them for other reasons, or because a member state asks.

What to actually look for

Read past the headline number. A composition line covering only the outer fabric is a partial answer, not a complete one.
Turn the garment inside out. Pocket bags, linings and waistband interfacing are visible and tell you more than the label does.
Check for a separate lining composition. If a lined garment lists only one fibre, that's a question worth asking.
Learn the four synthetic names. Polyester, polyamide, acrylic, elastane. Once you can spot those four, you can read almost any label.
Ask the brand. A brand that knows what's in its own garments will answer quickly. That response time tells you something on its own.

Where Elunne sits

The reason this brand exists is because we got tired of checking labels.

We wanted a safe space where we could safely choose chic and timeless styles that keep us comfortable all day without compromising in fabric compositions, fast fashion trends or boring cuts. We wanted to find the intersection of natural fibers, comfort and fashion we would want to wear again and again for many years to come.

We check the labels so you don't have to. This is what we're checking for.

Common questions

Is viscose a natural fibre? No. Viscose is a regenerated cellulosic — it starts as plant pulp, but the pulp is chemically dissolved and reformed into a new fibre. It sits between natural and synthetic, and it's usually sold as if it sits firmly on the natural side.

Is bamboo fabric natural? Almost never as sold. Most "bamboo" clothing is viscose made from bamboo pulp, which puts it in the same category as any other viscose. A label that says bamboo without saying viscose isn't telling you what the fibre is.

Is elastane natural? No. Elastane is a synthetic fibre, sold under the names spandex and Lycra as well. It appears in small percentages in a lot of clothing to help garments hold their shape, and in the EU it has to be declared in the composition.

Does "100% cotton" mean the whole garment is cotton? Not necessarily. It means the main fabric is. Components that aren't main linings and weigh less than 30% of the garment don't have to be declared separately, so pocket bags, interfacing, thread and partial linings can be something else entirely.

Which natural fibre is best for hot weather? Linen, then cotton. Linen is more breathable and dries faster; the trade-off is that it creases. Silk is cooler than it looks but harder to care for in heat.

Are natural fibres always better quality? No. A badly made linen garment will outlast nothing. Fibre is one input; construction, finishing and fabric weight are the others. Natural fibre is the floor, not the ceiling.