How much a fabric with stretch gives

Short answer: A knitted fabric with five percent elastane can typically stretch by about a fifth and return to shape. That equals a full size in circumference. But stretch is not the same as room, and the knit matters as much as the amount of elastane.

Five percent gives a fifth

A circumference of ninety centimetres can stretch to about a hundred and ten when the fabric has five percent elastane. That is a fifth, and it is enough to cover a full size. This is why close fitting pieces like panties can suit several body shapes within one size, as the fabric gives where it is needed. See bamboo panties.

The fabric finds its way back

Elastane is what makes the fabric pull back together after it has been stretched. Without elastane a knit can still give, but it often stays in the new shape and looks baggy after a few hours. With elastane the fabric returns as you move and keeps its shape through the day.

Stretch is not the same as room

A fabric can stretch a long way without being comfortable to wear stretched. When the fabric is pulled all the way out, it presses on the skin, and you notice it after a few hours. Think of stretch as a margin for movement and small differences in measurements, not as an extra size you can rely on all day.

Where stretch matters most

Stretch matters most where clothing should follow the body closely: around hips, thighs, feet and ankles. A sock has to pull over the heel and then stay put without slipping. That needs a fabric that gives a lot when you put it on and a little when it sits. See socks for men and women.

The knit gives stretch too

The amount of elastane is only half the story. The way the fabric is knitted matters just as much. A rib stretches far more than a jersey with the same amount of elastane, because the ribs lie in folds that can be pulled out. That is why rib is often used at cuffs, waistbands and necklines where clothing should close snugly.

Jersey and rib in one piece

Many garments combine the two knits. The body is jersey, which falls calm and smooth, while the edges are rib that holds the piece in place. A hoodie is a good example: the fabric in the body gives a little, while the cuffs and hem give a lot and spring back. See bamboo hoodie for women.

Use the stretch with care

Stretch means you can partly choose a smaller size, but not that you should. The fabric can be stretched, but it is not comfortable to wear a fabric pulled to its limit all day. Choose the size where the fabric rests lightly against the body without pulling, so the stretch is there when you move.

How to keep the stretch longest

Elastane does not handle high heat well. Wash at a low temperature and let the clothes dry flat or hanging rather than in a tumble dryer. Avoid pulling the fabric further than needed when you put it on. That way it keeps its ability to return, and the clothes fit as they should for longer.

Frequently asked questions

How much can a fabric with elastane stretch

With five percent elastane typically about a fifth of the circumference, which is roughly a full size. The knit can give more or less than that.

Does stretch mean you can take a smaller size

Partly. The fabric can stretch, but wearing a fabric pulled to its limit all day is not comfortable, so pick the size that rests lightly against the body.

What gives the most stretch

The knit. A rib with five percent elastane stretches far more than a jersey with the same amount, which is why rib is often used at cuffs and waistbands.