The care label is missing. Maybe it was cut out years ago because it scratched someone's neck, maybe it faded to a blank strip of white nylon, or maybe the sweater was hand-knit and never had one. You are standing at a rail with the garment in your hands and one question: what is this actually made of? It matters more than it seems, because fibre decides how a piece will wear, how warm it will be, how it should be washed and, often, whether it is the kind of vintage you were hoping for.
Your fingertips can answer a surprising amount of that question. Cotton, polyester blends, nylon, acrylic and wool each have a recognisable hand, a particular way of creasing, warming, stretching and catching the light. None of these tests is proof, and modern blends blur every line, but together they make you a far better judge of authentic vintage clothing than a label alone. This guide covers what each fibre tends to feel like and a few simple checks you can do in a shop without drawing looks.
01. Why fibre matters on a vintage rack
Fibre content shapes almost everything about a garment's life. A cotton tee softens and fades as it ages; a polyester one keeps its colour but may pill or hold onto odours. A wool sweater can last generations with care but attracts moths; an acrylic one is easy to wash but tends to fuzz and lose its shape. Knowing what you are holding helps you predict what the piece will look like after another winter of wear.
Fibre is also part of how collectors think about age. Certain fabrics were common in certain periods: cotton-poly blends on tees and sweatshirts at various points in the seventies and eighties, acrylic knits through the middle of the century onward, nylon shells on jackets and windbreakers. A fabric that seems out of step with the rest of a garment's details is a reason to look more closely. It is never, on its own, a verdict.
And there is the simple matter of comfort. Some people find certain wools itchy, some find synthetics clammy in summer, and some love the slippery feel of nylon. Knowing your own preferences by touch saves you from buying something that looks perfect and then never leaves the hanger.
02. How to touch a garment properly
A quick brush with a fingertip tells you little. To read a fabric, give it a few seconds of real attention:
- Rub it between thumb and fingers. Notice whether it feels dry, slick, waxy, fuzzy or crisp, and whether it makes any sound.
- Hold it against the inside of your wrist. This skin is more sensitive than your fingertips and picks up itch and temperature quickly.
- Scrunch a corner in your fist for a few seconds, then let go. Watch how quickly and how completely the creases disappear.
- Stretch a small section gently across the grain, then release. See whether it springs back or stays slightly loose.
- Hold it up to the light. Look at the sheen and at how open or tight the weave or knit is.
Choose an inconspicuous spot, like the inside of a hem or the underside of a sleeve, and be gentle. Fragile old fabrics deserve the same care you would want for your own clothes.
03. Cotton: cool, dry and honest
Cotton has a matte, dry feel that most people recognise instinctively. It tends to feel slightly cool when you first touch it, it breathes well against skin and it does not generate much static. Well-worn cotton jersey becomes very soft, almost buttery, and older tees often have a thin, airy hand that feels lighter than its weight suggests.
The scrunch test is revealing. Pure cotton creases easily and holds those creases for a while after you let go. Woven cotton, like oxford cloth or canvas, will keep a crumpled mark quite clearly. Cotton also has little natural stretch unless it is knitted, and even then it recovers slowly; that is why the collars of old cotton tees often go wavy.
When cotton fades, it usually fades softly and unevenly, with lighter areas along seams, folds and edges. That kind of fading, along with a slightly fuzzy surface from many washes, is one of the things people love most about old cotton sweatshirts and tees.
04. Cotton-poly blends: the soft, springy middle
Blends of cotton and polyester appear constantly in vintage, especially in tees and sweatshirts from periods when they were popular for their easy care and shrink resistance. A blend often feels thinner and drapier than pure cotton, with a slight slickness or springiness under the fingers.
The tell-tale signs are subtle. A blend creases less than pure cotton and bounces back faster from a scrunch. It may feel faintly cooler and smoother, and some higher-polyester blends develop tiny pills on the surface, especially under the arms and along the sides where they rub. Fading tends to be gentler and more even, with less of the chalky look that heavy cotton gets.
Very thin, almost see-through tees with a soft, clingy drape are often blends that have worn down over the years. Many collectors seek out that feel deliberately, so if you love it, you will start recognising it in seconds.
A label tells you what a garment was meant to be. Your hands tell you what it has become after years of wear.
05. Nylon and polyester: smooth, slick, quick to recover
Synthetic fibres like nylon and polyester have a smoother, slicker surface than natural fibres. On woven pieces, such as windbreakers, track jackets and team jackets, they often make a soft rustle when you move them. Run a hand over a nylon shell and it feels almost frictionless; polyester can feel similar or slightly more papery, depending on the weave.
Both recover quickly from the scrunch test. Crumple a nylon jacket in your fist and most creases fall away within moments. They also tend to feel warmer and less breathable against skin, and they build up static more readily, which is why an old polyester shirt sometimes clings in dry winter air.
Nylon used in older outerwear sometimes has a coating on the inside to help it shed water. Feel the inside surface. A dry, intact coating feels smooth. A coating that has started to break down may feel tacky or flaky. That is worth knowing before you buy, because it is very hard to fix and can shed onto other clothes.
Satin, tricot and shiny knits
Satin team jackets and many track tops use synthetic fibres woven or knitted for sheen. Satin has a liquid, cool slip and catches light strongly. Tricot, common on track jackets, has a fine knit surface with a soft gloss and some stretch. Both feel unmistakably synthetic once you know them, and both tend to show snags and pulls more than matte fabrics do.
06. Acrylic: soft at first touch, with a squeak
Acrylic is a synthetic fibre that was developed partly as an alternative to wool, and it often turns up in sweaters, scarves, toques and cardigans. At first touch it can feel very soft, sometimes softer than wool. The difference shows up when you hold it longer or rub it more firmly.
Many people describe acrylic as having a faint squeak or a slightly plastic slipperiness between the fingers. It tends to feel warm quickly but does not breathe like wool, so it can feel close against skin. It also stretches out more easily and recovers less, so cuffs and hems on old acrylic sweaters often look flared or loose. Pilling tends to be heavy and fuzzy, especially on high-friction areas.
Acrylic is not a bad fibre. It is easy to wash, often bright in colour and usually forgiving for people who find wool itchy. Just know that an acrylic knit will behave differently over time than a wool one, and judge its condition with that in mind.
07. Wool: springy, warm and a little alive
Wool has a particular bounce. Squeeze a wool sweater and it pushes back; stretch a wool knit gently and it tends to return to shape. It often feels slightly dry and warm to the touch, even in a cool room, and many wools have a faintly crisp or toothy surface rather than the uniform smoothness of synthetics.
Different wools feel very different. Lambswool and merino are fine and soft; shetland can feel more rustic; heavy outer wools, like those in melton coats and varsity jacket bodies, are dense and felted. Some wool keeps a faint natural scent when it gets a little damp, a clue some people use, though not one you can test easily in a shop.
Wool has its own condition issues. Look for small moth holes, especially in folds, under arms and at cuffs. Check for felting, where the fibres have matted together, often after a hot wash. A felted sweater feels stiff and thick and will usually have shrunk. Light pilling is normal and can be removed carefully; deep matting cannot.
08. When the clues contradict each other
Blends are where touch gets humbling. A wool-acrylic sweater can feel springy like wool and squeak a little like acrylic. A cotton-nylon jacket might look matte but recover like a synthetic. Brushed or washed finishes can make polyester feel almost like cotton, and a heavily worn cotton can feel almost silky.
When the signs disagree, look for other evidence: any remaining label fragments, the garment type, the construction, the way it has faded and worn. Combine everything you can see and feel, and allow yourself to say that you are not sure. Experienced collectors make educated guesses, not declarations.
Some people mention burn tests, where a few threads are lit to see how they react. That is a technique for your own scraps at home with proper caution, never for a garment that is not yours and never in a shop.
09. Training your hands over time
The best way to get good at this is repetition with feedback. Start with clothes you already own and whose labels you can still read. Close your eyes, feel each one, guess the fibre, then check. Do the same in shops, feeling a piece before turning over the label. Within a few weeks you will begin to sense the difference between a cotton and a blend tee from the first touch.
When you browse vintage clothing, at Throwback Vault or anywhere else, let your hands lead for a moment before your eyes take over. A sweatshirt with exactly the dry, soft cotton hand you love, or a wool knit that springs back properly, is often a better buy than a louder piece with the wrong feel. Fibre is the part of a garment you live with every time you put it on, so it deserves the first opinion.
