Cotton: how do you recognise good quality?
Two white t-shirts, the same label reading one hundred per cent cotton, the same price. After five washes one still holds its shape, while the other has turned see-through and stretched at the neckline. The composition was identical, so the difference lay somewhere else.
What decides the quality of cotton?
The quality of cotton comes down to three things: the length of the fibre, the weight of the fabric and the way it is finished, and none of them appears on a standard label. The composition line on its own tells you almost nothing.
Fibre length matters most. Long-staple cotton gives a smoother, stronger yarn that pills less and holds its colour longer. Short fibres stick out of the twist, so the surface turns rough much sooner. Makers rarely state it, but you can recognise the difference by touch and by how the fabric behaves in the light. Names such as pima or supima refer precisely to long-staple varieties, and they are the only signal that sometimes reaches the label.
How can you recognise good cotton in a shop?
The simplest test is to hold the fabric up to the light and check whether it recovers after being crushed in your hand. Both take a few seconds and call for no technical knowledge at all.
| Test | What to do | Good cotton | Poor cotton |
|---|---|---|---|
| light | hold it up to a window or a lamp | light passes evenly, a dense weave | single threads show through, gaps are visible |
| crushing | squeeze it in your hand for five seconds | it returns almost smooth | a clear crease remains |
| weight | rest it on your palm | a noticeable weight at the same thickness | almost weightless, thin |
| surface | run a finger across it | smooth, uniform | tiny fibres, roughness |
The first two rows are enough for everyday shopping. If the fabric lets light through unevenly and holds on to a crease, every wash will only deepen both problems.
Dense cotton behaves in a recognisable way: in daylight the weave looks even with no gaps showing through, and in movement the fabric falls calmly instead of clinging to the body.
How much should cotton weigh in a given piece?
Fabric weight tells you how much material there is per square metre, and it is what decides whether a t-shirt turns see-through and whether a sweatshirt keeps its shape. With cotton, the useful range is wide.
- 120 to 150 g/m². Thin tees and summer tops. In light colours they are usually see-through.
- 160 to 200 g/m². The standard for t-shirts meant to last a season. The best balance of price and durability.
- 250 to 350 g/m². Sweatshirts and heavier shirts. The fabric holds its form and does not stretch at the neckline. Jersey sets made of sweatshirt cotton also fall within this range.
The middle range covers most everyday pieces. When you choose t-shirts and shirts, look for exactly these values, because below one hundred and sixty grams white stops being opaque.
Do blends always make cotton worse?
A small blend usually improves how a fabric wears, because it limits creasing and helps the fabric recover its shape, and it only starts to work against you above twenty per cent. Pure cotton is not always the better choice.
Two to five per cent of stretch fibre keeps a t-shirt from losing its shape at the elbows or the waist. A share of up to twenty per cent of a smooth synthetic yarn shortens drying time and reduces creasing, which can be a real advantage in shirts. Above that threshold the fabric starts to lose its breathability, and that is the one quality of cotton nothing else replaces. For shirts worn to work, a small blend can therefore be a more sensible choice than a pure composition.
What should you avoid when buying cotton?
Four signals should catch your attention even before the fitting room.
- Avoid fabrics that let light through unevenly. It is a sign of uneven yarn and of the first hole after a few washes.
- Never judge by the words one hundred per cent alone. Thin, low-weight cotton performs worse than a good blend.
- Avoid very cheap white t-shirts. White shows the quality of the weave and the finish most mercilessly.
- Avoid pieces with visible fibres on the surface. Short fibres will pill in the first wash.
The cut is a separate question. Cotton without any blend does not spring back, so it works less well in pieces fitted at the waist than in straight ones. If you want a clear line all day, choose either a looser cut or a composition with some stretch. One more rule applies to washing cotton: the first wash always in cold water and on its own. Deeply dyed cotton can bleed colour, and with light pieces in the same drum the result can be permanent, as the guide to dye transfer in the wash explains.
Is organic cotton better quality?
The certificate describes how the cotton was grown, not the length of its fibre, so it does not necessarily mean a better fabric. Low-weight organic cotton will perform worse than dense conventional cotton.
Why does a cotton t-shirt stretch?
Usually because of a low fabric weight and no stretch in the blend, and less often because of washing itself. Fabric below one hundred and sixty grams loses its shape at the neckline after only a few wears.
How do you wash cotton so it keeps its colour?
At up to forty degrees, inside out, separately from light pieces. With printed hoodies, also avoid the tumble dryer, because the print cracks.
Is cotton suitable for autumn?
It works as a base layer and in heavier weights, in sweatshirts for example. As the only layer in low temperatures it loses to sweaters, because it stops keeping you warm once it is damp.
Go back to those two t-shirts from the beginning. The difference came from the fibre and the weight, two things missing from the label that you can still check in seconds. The same test is worth doing with cotton dresses, where weight also decides whether the fabric turns see-through in the sun.
Cotton is one of the groups set out in a guide to types of fabrics.