Most talk about jeans is about cut: the leg, the rise, the hem. But two pairs with the same cut can look quite different by the afternoon, and the reason is usually the fabric. Denim is a cotton twill, traditionally woven with an indigo-dyed thread in one direction and an undyed one in the other. What is added to that cotton, or left out, decides how stiff the jean is, how it hangs and how it changes as you wear it.
Pick a fabric below, then move the slider to see what a few wears between washes tend to do. The drawing is an illustration of typical behaviour, not a measurement of any one pair.
Rigid denim has no stretch fibre in it. It is stiff when new, holds the cut exactly as it was drawn and creases sharply at the hips and behind the knees. Over weeks it softens and fades along those creases, which is why people like it: the pair slowly takes on a look of its own. A rigid straight leg stays a straight leg at six in the evening.
Many jeans now mix cotton with a second fibre such as lyocell, a smooth fibre made from wood pulp, often with a touch of elastane. The result drapes more, so the leg falls in a longer, softer line and the fabric looks a little dressier. It gives slightly when you sit down but does not stretch much.
Add roughly two to three per cent elastane and jeans move with you, which is the point of them. The trade-off is that the fabric is less able to hold a sharp shape, and stretch jeans tend to loosen at the knee over a day or two of wear. A wash usually brings them back. Stretch is a good choice for long days, travel and anything where you are up and down a lot.
The cut tells you the silhouette on day one. The fabric tells you the silhouette on day three.
A simple rule: let the fabric and the rest of the outfit disagree a little. Rigid denim has structure of its own, so it works with soft things: a loose knit, a draped shirt, a slouchy coat. A blend sits well with almost anything and is the easiest to dress up with a tailored jacket. Stretch denim has the least edge, so pair it with something that has some, such as a crisp collar, a structured blazer or a pointed boot.
| Fabric | Wear it with | Good for |
|---|---|---|
| Rigid | Knits, soft shirts, loose coats | A pair you will keep for years |
| Blend | Blazers, tucked shirts, loafers | Smart-casual days |
| Stretch | Crisp collars, structured jackets | Travel and long days |
If a pair feels uncomfortable it will not get worn, however good the fabric. Equally, a rigid pair you have owned for years has already softened and may behave more like a blend. Second-hand jeans are often older, heavier cotton: worth a look if you like the rigid feel without the break-in, and re-wearing a pair you already own is always the cheapest option.
Good rigid pairs start at around €15 and go well past €100; the fabric label matters more than the price tag.