Fabrics and care · 8 October 2026 · 3 min read
What does elastane do in a fabric?
What is elastane in fabric? The small stretch fibre in trousers and dresses, how it changes fit, ease and recovery, and what your tailor needs to know about it.
InspirationA small fibre that adds stretch and spring
Elastane is a synthetic fibre that can stretch to several times its length and snap back. It is blended in small amounts, often just a few per cent, with cotton, polyester or viscose, so the fabric gives when you move and then returns to shape. Spandex is the North American name for the same fibre, and Lycra is a trade name for it.
You rarely see elastane itself. It is usually wrapped inside another fibre or hidden in the core of the yarn, so a cotton elastane fabric still looks and feels like cotton, only with a little give.
Where it shows up in a wardrobe
Elastane turns up wherever a garment has to move with the body without bagging. The most common places:
- cotton or polyester trouser fabrics, especially for cigarette pants and slim straight trousers
- stretch denim, which is why some jeans and denim shirts feel softer than others
- jersey for tops and dresses, and stretch crepe for fitted dresses
- stretch velvet, which behaves more like a knit than a woven velvet
- fabric for churidar, where a close fit has to survive sitting and bending
How it changes fit, ease and recovery
Ease is the room a garment allows beyond your body measurements. In a non-stretch cloth, that room is what lets you sit, reach and breathe. A stretch cloth does part of that job itself, so the garment can be cut closer, sometimes with less ease than usual, and still feel comfortable. Our guide to ease for dresses, co-ords and trousers shows why ease differs by garment.
Recovery is the other half. Good elastane fabrics return to shape after you stand up, so trousers do not keep the outline of your knees by the evening. Poor recovery, or very old elastane, leaves a garment slack in exactly the places it should be neat.
The direction of stretch matters too. Many woven fabrics stretch only across the width; others stretch both ways. A close fit also shows more of the body’s lines, so some people choose a stretch fabric and keep a little ease anyway for a softer look.
What a tailor needs to know about it
A stretch fabric changes several decisions at the cutting table, so share what you know when you ask for a quote:
- That it stretches at all, and roughly how much: pull a short length across the width against a ruler and note how far it goes.
- Which direction stretches, width only or both ways, because the stretch normally runs around the body.
- How you want it to fit: close and sleek, or with the usual ease and the stretch kept for comfort.
- Your measurements as body measurements, not garment measurements, so the stretch can be planned for. The trouser size guide shows how to take them.
Caring for stretch fabrics
Heat and chlorine are what wear elastane out. Wash at a cool or warm setting, skip bleach, keep it out of a hot dryer, and press with a moderate iron, ideally through a cloth. Over the years, elastane loses some of its spring however careful you are, and tiny shiny threads can start poking through the surface; that is the fibre ageing, not a sewing fault.
If you have a stretch fabric you would like made into trousers or a fitted dress, our Stitching Only service covers your own fabric, and a stretch denim kurta is discussed in can a kurta be made from denim? To begin, request a quote; we confirm what is possible on your fabric and design.
Common questions
Is Lycra the same as elastane?
Yes, in practice. Elastane is the general name for the fibre, spandex is the usual North American word, and Lycra is one trade name for it.
Do I need stretch fabric for a shalwar?
No. A shalwar is cut loose with plenty of room, so stretch adds little. It is far more useful for churidar, cigarette pants and other close-fitting trousers.
Why have my stretch trousers gone baggy at the knees?
The elastane has lost some of its recovery, usually from age, heat in washing and drying, or a fabric with only a little stretch fibre. It cannot be restored, so gentle care from the start helps most.
