Natural Fibres vs Synthetic Fibres: What's the Difference?

When you're choosing clothes, it's easy to concentrate on the colour, shape and fit and give much less thought to what the garment is actually made from. But the fabric can make an enormous difference to how something feels, how it hangs, how long it lasts and how comfortable it is to wear.

Understanding the difference between natural and synthetic fibres can therefore help you make better choices for your wardrobe. It can also help you think about durability, care and sustainability rather than simply whether you like something when you first try it on.

At Covet, we've always had a particular love of natural fibres. Lyn explains why:

“We've always believed in natural fibres rather than man-made ones. They hang better and breathe better, so you can look good while still feeling comfortable. Sometimes something is so good that I'd break the rule, but overall I'd say natural fabrics win for me. They can also be a more environmentally responsible choice, particularly when they're well made, looked after and worn for a long time.”

— Lyn, Covet

That last point is worth exploring because the answer isn't quite as simple as saying that everything natural is good and everything synthetic is bad. Different fibres have different strengths, and how a garment is produced, how long you keep it and how you care for it all matter.

So rather than declaring one outright winner, this guide looks at natural and synthetic fibres side by side and explains where each can make sense.

Fabric affects far more than appearance – it can change the feel, drape and comfort of a garment.

Natural Fibres vs Synthetic Fibres

The fundamental difference is where the fibre comes from.

Natural fibres originate in nature. Plant-based examples include cotton and linen, while wool and silk come from animals. Synthetic fibres are man made through chemical processes, usually using petrochemical-derived materials. Common examples include polyester, nylon, acrylic and elastane.

That difference affects everything from breathability and feel to durability, washing, price and environmental impact.

It also explains why reading the composition label inside a garment can tell you much more than you might expect.

What Are Natural Fibres?

Natural fibres have been used to make clothing for thousands of years. They tend to be valued for their feel, breathability and the way they behave against the body.

Cotton

Cotton is one of the most familiar natural fibres. It's soft, breathable and comfortable against the skin, which is why you'll find it in everything from T-shirts and shirts to dresses and denim.

Different weaves and weights can make cotton feel completely different, so a crisp cotton shirt and a soft jersey T-shirt may contain the same basic fibre but behave very differently.

Linen

Linen is made from flax and is particularly good in warm weather because it's breathable and allows air to circulate around the body.

It also has a wonderfully relaxed character. Yes, linen creases – but we'd argue that's part of its charm rather than something that needs to be eliminated completely.

Linen's natural texture and breathability make it a perennial Covet favourite.

Wool

Wool is naturally insulating, which makes it an obvious choice for knitwear, coats and winter layers. But good wool can also regulate temperature remarkably well, so it isn't simply about keeping warm.

There are many different types and qualities of wool, from substantial traditional knits to beautifully soft merino.

Silk

Silk is known for its softness, drape and subtle lustre. It's lightweight but can also help regulate temperature, making it surprisingly versatile.

It generally requires a little more care than cotton or linen, but a beautiful silk shirt, scarf or dress can remain in a wardrobe for years.

What Are Synthetic Fibres?

Synthetic fibres are manufactured rather than harvested from plants or animals. They've become enormously important to modern clothing because manufacturers can engineer them to have particular characteristics.

This is where the argument becomes more nuanced. There are occasions when those characteristics are genuinely useful.

Polyester

Polyester is one of the most widely used synthetic fibres. It's strong, relatively inexpensive, dries quickly and resists creasing, which makes it extremely practical.

The downside is that polyester generally isn't as breathable as many natural fibres and is derived from fossil fuels. It can also release tiny plastic fibres during washing.

Nylon

Nylon is strong, lightweight and resistant to wear. Those properties make it particularly useful in outerwear, hosiery, bags and performance clothing.

As with polyester, however, nylon is a synthetic plastic-based fibre and isn't biodegradable in the way many untreated natural fibres can be.

Acrylic

Acrylic is often used as an alternative to wool because it can be lightweight, warm and relatively inexpensive.

It can be useful, particularly where easy care or price is important, although it generally doesn't have the same natural breathability and feel as a good-quality wool.

Elastane

Elastane – sometimes known as spandex or Lycra – provides stretch.

You often only need a small percentage of it in a garment to make a significant difference. A little elastane in a pair of jeans or fitted trousers, for example, can make them much more comfortable and help them move with the body.

This is a good example of why we wouldn't automatically reject a garment simply because its label contains a synthetic fibre.

Get into the habit of checking fabric composition as well as size and washing instructions.

Natural vs Synthetic Fibres: The Key Differences

There are exceptions to almost every rule, but the table below gives a useful starting point.

Breathability and Comfort

This is probably where Lyn's preference for natural fibres is most noticeable. Cotton, linen and wool can be wonderfully breathable and comfortable to wear.

That matters particularly when a garment sits close to the skin or you're wearing it throughout the day.

Durability

Synthetic fibres can be exceptionally durable. Nylon in particular is valued for its strength, while polyester can withstand considerable wear.

Natural doesn't necessarily mean fragile, though. A well-made wool coat, linen shirt or cotton garment can last for many years when cared for properly.

Care and Maintenance

Synthetic clothing often wins on convenience. Many pieces are machine washable, dry quickly and resist creasing.

Natural fibres can demand a little more attention. Wool may require a gentle wash, linen will crease and some cotton can shrink if washed or dried at excessive temperatures.

For us, that doesn't necessarily make them inferior. Sometimes accepting a few creases is a perfectly reasonable trade-off for wearing something that feels lovely.

Cost

Natural fibres can cost more to produce, although price alone tells you surprisingly little about the quality of a garment.

A more useful question is often how much will I wear this? Something that costs more but becomes a favourite for several years can represent much better value than a cheaper garment that's rarely worn.

Environmental Impact

This is the most complicated comparison of all.

Natural fibres have some obvious advantages. Many can biodegrade under appropriate conditions, and they don't create plastic microplastics in the same way conventional polyester, acrylic and nylon can.

But natural doesn't automatically mean environmentally harmless. Growing crops uses land and water, wool and silk involve animal agriculture, dyes and processing matter, and manufacturing and transport all have an environmental footprint.

Synthetic fibres have their own issues, particularly reliance on fossil-fuel feedstocks, end-of-life persistence and the shedding of microplastics. On the other hand, their durability can sometimes allow a garment to remain useful for a long time.

So sustainability is better judged by looking at the whole garment rather than one word on its label.

Pros and Cons of Natural Fibres

Advantages of Natural Fibres

• Often breathable and comfortable against the skin.
• Can regulate temperature well.
• Beautiful natural texture and drape.
• Many can be very long-lasting when properly cared for.
• Some natural fibres are biodegradable under the right conditions.

Drawbacks of Natural Fibres

• They can be more expensive.
• Some crease easily – linen being the obvious example.
• Certain fibres can shrink if washed incorrectly.
• Wool and silk can require more careful maintenance.
• Natural production can still have significant environmental impacts.

Pros and Cons of Synthetic Fibres

Advantages of Synthetic Fibres

• Often extremely durable.
• Generally easy to wash and quick to dry.
• Can be highly resistant to creasing.
• Often less expensive.
• Technical properties can make them particularly useful for activewear and outerwear.

Drawbacks of Synthetic Fibres

• Some are less breathable.
• Most conventional synthetic fibres are derived from fossil fuels.
• They can shed microplastics during use and washing.
• They generally don't biodegrade readily.
• Some synthetic fabrics can feel less pleasant against the skin.

Rather than judging a garment by one fibre alone, think about how it feels, how it will be worn and how long you hope to keep it.

Which Is Better, Natural or Synthetic Fibres?

If you asked Lyn to choose, you already know which way she'd lean. Natural fibres have always been an important part of Covet's approach because we love how they feel, breathe and hang.

For everyday shirts, summer dresses, knitwear and pieces worn close to the body, we'd generally start by looking for cotton, linen, wool and other good-quality natural fibres.

But we wouldn't turn down a brilliant garment simply because it contains something synthetic.

For rainwear, for example, the water resistance and durability of technical synthetic materials can be exactly what you need. Nylon can be useful where strength and low weight matter. A little elastane can transform the comfort and fit of trousers or jeans.

Then there are blended fabrics. Combining natural and synthetic fibres can sometimes give you the advantages of both – perhaps the softness and breathability of cotton with extra durability or stretch.

The composition matters, but so does the finished garment.

If you'd like some ideas for actually wearing these materials, have a look at our guide to styling natural fabrics like cotton, linen, and wool.

How to Choose the Right Fabric for Your Wardrobe

The simplest advice we can give is to start looking at the labels.

Don't feel you need to memorise a complicated list of good and bad materials. Instead, ask a few practical questions.

Think About When You'll Wear It

For a summer dress or shirt, breathability may be your priority, making cotton or linen particularly appealing. For a winter jumper, warmth and comfort might lead you towards wool. For a waterproof jacket, a technical synthetic fabric may make much more sense.

Consider How It Feels

Touch the fabric. Try the garment on. Move around in it.

One of the reasons we enjoy having physical Covet shops is that clothes aren't just visual. How something feels and hangs on the body can be difficult to understand from a photograph alone.

Look at the Entire Composition

A garment doesn't have to be 100% one material. Blended fabrics are extremely common and can be very useful.

If you see a cotton trouser containing a small amount of elastane, for example, think about what that additional fibre is doing. It may provide exactly the stretch that makes the trousers comfortable enough to wear all day.

Think About Longevity

Ask yourself whether you can imagine wearing the piece repeatedly.

For us, this is one of the most useful ways to think about sustainability. Whatever a garment is made from, buying clothes you genuinely love, wearing them regularly, caring for them properly and keeping them for longer is preferable to treating clothing as disposable.

Don't Be Ruled by the Label

Fabric composition is useful information, but it isn't the whole story. Construction, quality, fit and how useful something will be in your life matter too.

Our natural preference at Covet is exactly that – a preference, rather than an absolute rule.

At Covet, natural fibres remain our first instinct – but the quality and usefulness of the finished garment matter too.

Final Thoughts

The debate around natural fibres vs synthetic fibres can sometimes make clothing sound much simpler than it really is.

Natural fibres such as cotton, linen and wool offer breathability, comfort and beautiful texture, and they're the materials we're naturally drawn towards at Covet. Synthetic fibres such as polyester and nylon can offer durability, easy care, stretch and technical performance that natural materials can't always provide.

Neither label tells you everything about a garment.

For Lyn, natural still wins most of the time – particularly when comfort, drape and feel matter. But there's room for exceptions, and sometimes a carefully chosen synthetic fibre or blend makes a garment better at doing its job.

Perhaps the most useful habit is simply to become curious about what your clothes are made from. Check the label, feel the fabric, think about how you'll wear it and consider whether it's something you'll still want in your wardrobe years from now.

Because ultimately, one of the best wardrobe choices you can make is to buy something you genuinely enjoy wearing – and then wear it again and again.