What stretch does to the choice of size
Short answer: Stretch gives the garment room to adapt to the body. The more the fabric stretches, the less a couple of centimetres in the chart matter. Without stretch the measurement has to fit, and with stretch you can often choose the smaller size.
Stretch covers small differences
An elastic knit can give several centimetres across without looking strained. That is often enough to bridge a gap between two sizes, so you can choose by how you want the piece to sit. Stretch makes the chart more forgiving, but it does not replace the measurements.
Too much room becomes a sack
If you choose too large in an elastic fabric, you lose the shape completely, because there is nothing to tighten. The fabric hangs slack and gathers in folds at the waist and under the arms. An elastic piece has to sit close to work. See bamboo shirts for women for the more relaxed cuts.
Woven fabric forgives nothing
If the fabric has no stretch, the measurement has to fit. That is why shirts and trousers are more sensitive than knits. A woven fabric gives only a little, and a wrong size is felt at the shoulders, chest and elbows. Measure yourself carefully and read the chart closely before choosing a size in a stiff fabric.
Stretch across and along
A knit usually stretches most across and far less along. That means width forgives more than length. If a piece is too short, stretch helps little, while a slightly narrow back or waist often works fine. See women's long-sleeved bamboo T-shirt.
How to tell if there is stretch
The composition mentions elastane when there is stretch in the fabric, and the description often mentions the word elastic. You can also feel it by hand, by pulling gently across the fabric. If it springs back, there is stretch. If it stays stretched out, it is a stiff fabric.
Stretch and close-fitting pieces
If you want a close fit, you can often size down in an elastic fabric. The fabric gives and adapts, so the piece sits close without pinching. If you want a looser cut, choose your usual size or slightly above. See period underwear for a piece where the fit sits close.
Stretch changes over time
With wear and washing, an elastic fabric can relax a little, especially at the waist and edges. That is a normal part of how the piece lives. Follow the care label and avoid hot tumble drying if you want the fabric to hold its shape longer. Gentle care is the simplest way to extend its lifespan.
When you are between two sizes
If you are between two sizes, look at the fabric first. If it has stretch, you can usually choose the smaller and get a close fit. If it does not, choose the larger so you have room to move. The chart and the composition tell you what is right.
Frequently asked questions
How much stretch does a typical knit have?
Enough to give several centimetres across, but far less along. It varies with the composition, so always check what the page says about the fabric.
Should I size down in elastic pieces?
Often yes, if you want a close fit. For a looser cut, stay with your usual size or choose a slightly larger one.
How can I tell if there is stretch?
The composition mentions elastane, and the description often uses the word elastic. You can also pull gently across the fabric and feel whether it springs back.
