Natural fabrics such as cotton, linen, wool and silk breathe, absorb moisture, press beautifully and are the easiest to sew, which is why they suit most garments you wear against the skin. Synthetics such as polyester, nylon and elastane resist wrinkles, dry fast, hold stretch and cost less, which makes them the better choice for activewear, swimwear, rain shells and linings. For everyday clothes, start natural; add a synthetic where you need stretch, durability or weather resistance.
How do natural and synthetic fibers compare?
| Feature | Natural (cotton, linen, wool, silk) | Synthetic (polyester, nylon, acrylic, elastane) |
|---|---|---|
| Source | Plants and animals | Petroleum-based polymers |
| Breathability | High | Low, unless knitted open or engineered |
| Moisture | Absorbs and holds it | Repels it; wicks when engineered |
| Wrinkling | Linen and cotton crease; wool and silk less | Resists creasing |
| Pressing | Takes a sharp crease with heat and steam | Softens and can melt; creases are hard to set |
| Pilling | Low in cotton and linen; wool can pill | Common in polyester and acrylic knits |
| Durability | Good; cotton weakens in sunlight | Very high; abrasion-resistant |
| Drying | Slow | Fast |
| Smell in wear | Low | Holds body odor in heat |
| Static | None | Common |
| Price | Medium to high | Low to medium |
The third group, regenerated cellulose fibers such as viscose, modal and lyocell (Tencel), comes from wood pulp and behaves like a natural fiber in wear. The comparison of cotton, linen and viscose covers the most common of them.
Why do natural fabrics feel better to wear?
Cotton, linen, wool and silk all absorb water: cotton can take up around 8 % of its weight in moisture before it feels damp, wool around 15 %. On a warm day that absorbed sweat moves away from the skin and evaporates from the fabric, and the open structure of most natural weaves lets air through. The result is that a cotton shirt feels dry and cool where a polyester one feels clammy.
Polyester absorbs less than 1 % moisture. Sweat stays on the skin until it runs or evaporates. Activewear gets around this with special yarn shapes and open knits that wick, which is why a running top can be comfortable and a polyester satin blouse is not. Bacteria also thrive in the warm, dry environment of polyester, which is why a synthetic top smells sooner than a cotton one.
Wool deserves a special mention: it insulates when damp, resists odor and regulates temperature, and fine merino knits are comfortable in summer as well as winter.
Which is easier to sew and press?
Natural fibers, nearly always. Cotton and linen take a press from a hot iron and hold the crease; a seam pressed open stays open, a hem pressed up stays up. Silk and wool press well with steam and a pressing cloth. Pressing is half of what makes a handmade garment look finished, and natural fabrics reward it.
Polyester and nylon soften at iron temperatures well below cotton's. Press too hot and the fabric shines, puckers or melts onto the sole plate; press too cool and the crease does not set. The window is narrow. Polyester also tends to pucker along a seam because the fibers do not compress, so a slightly loose thread tension, a shorter stitch and a fine needle help. Nylon is slippery and static-prone. Elastane blends need a stretch needle and a stretch stitch, whatever the main fiber.
Synthetic edges fray less than linen or loosely woven cotton, and nylon can be heat-sealed, which is one real advantage in bags and outdoor gear.
How do they wash and wear?
Synthetics are the low-maintenance choice. A polyester garment comes out of the washing machine almost ready to wear, dries in an hour, does not shrink and keeps its color for years. Cotton shrinks 3–5 % unless prewashed, linen creases the minute you sit down, wool must be washed cold or by hand, silk often needs hand washing.
In return, natural fibers age gracefully. Linen and cotton soften, wool holds its shape for decades, silk keeps its sheen. Polyester knits pill, acrylic loses its loft, and nylon yellows in sunlight. A natural garment that has been well cared for looks better after years than a synthetic one, which looks the same until it suddenly looks tired.
Prewash everything natural before you cut; the prewashing guide covers the temperatures. Synthetics rarely need it, but a wash removes finishing chemicals and settles any blend partner.
What about blends?
Most fabric in shops is a blend, and many blends are sensible. Cotton with 3–5 % elastane gives a woven trouser fabric the give it needs at the knee without changing how it breathes. Polyester-cotton poplin (often 65/35) wrinkles far less than pure cotton and still feels reasonable, which is why it is common in uniforms and shirts. Wool with a little nylon lasts longer in socks and coats. Linen-viscose drapes better and wrinkles less than pure linen.
Blends with more than about 50 % synthetic behave like a synthetic: they hold odor, pill and resist pressing. Read the fiber content on the bolt or the listing, not the name of the fabric, and the guide to fabric descriptions explains the rest of the label.
Which is more sustainable?
Neither is clean. Cotton uses a great deal of water and, unless organic, pesticides; polyester comes from fossil fuels and sheds microfibers in the wash. Linen and hemp need little water, wool is renewable, and recycled polyester reuses bottles but still sheds. A fabric that will be worn for years beats any fiber that ends up in a drawer, so the longest-lasting choice for the garment is usually the greenest. Sustainable fabric choices goes further, including thrifted fabric and bedsheets.
Which should you choose?
- T-shirts, shirts, blouses, dresses, trousers and anything worn next to the skin: natural fibers or regenerated cellulose. Cotton, linen, viscose, lyocell, wool, silk.
- Activewear, swimwear and leggings: synthetic. Polyester or nylon with 15–25 % elastane; nothing natural recovers or dries as well.
- Rain jackets, windbreakers, bags, outdoor gear: nylon or polyester, often coated. Natural fibers absorb rain.
- Linings: a viscose or cupro lining for comfort, polyester for durability and price; acetate for a slippery jacket lining.
- Fitted woven trousers, skirts and jackets: a natural fiber with 2–5 % elastane. The best of both.
- Work shirts, uniforms, anything washed daily: a polyester-cotton blend, if you can accept the feel.
- Children's everyday clothes: cotton or cotton-elastane. Washable, breathable, forgiving.
- A first project: a mid-weight cotton. It presses, feeds and forgives, and the guide to choosing fabric for a pattern explains what to look for on the bolt.
Treat synthetics as tools for a job rather than a cheaper substitute for a natural fabric. Where stretch, water resistance or a fast-drying weave matter more than feel, they win outright; everywhere else, a natural fiber will be nicer to sew and nicer to wear.