When you fall between two sizes
Sep 20, 2026
Short answer: Choose the smaller size when the fabric has elastane and the larger one when it does not. Elastane gives, firm fabrics do not. Think about what the garment is for too, since its purpose often decides which of the two sizes is right.
Why you end up between two sizes
A size guide splits the body into fixed ranges, but bodies do not follow ranges. That is why many people land right on the border, especially when their measurements sit close to a change. It is not a sign that anything is wrong. It just means you need a little more information about the item before you choose.
Knits with elastane give
A knit with two to five percent elastane stretches and adapts to your body. The fabric springs back as you move and follows your shape without pulling. That is why the smaller size is often right in women's bamboo tops, where a close fit is the point and extra fabric would only fold.
Firm fabrics do not give
Without elastane, the garment has to fit as it is, and the larger size is the safe choice. A piece in firm fabric that is too small pulls at the shoulders and hips and cannot adapt. This also applies to shaped items like a bamboo bra, where the shape is sewn in and a size too small presses all day.
Purpose decides
If the garment must sit close to do its job, choose the smaller size. That goes for underwear and tops meant to lie smoothly under other clothes. If it needs room for movement or layers underneath, choose the larger one. Think about when you will wear it, and the choice often becomes clear quickly.
Check the fibre content
If you are unsure, look at the fibre content in the product description. If it lists elastane, the fabric gives. If it lists a single fibre, or the fabric is woven rather than knitted, it gives less. That small detail often makes the choice between two sizes simple, and it only takes a moment to find.
Socks follow their own rule
Socks are usually sold in ranges of shoe sizes. If you fall between two, choose the smaller one, because a sock that is too large folds in the shoe and can rub. The fabric in bamboo socks for women stretches easily over the foot, so the smaller size sits smoothly without pressing.
Think about washing and wear
Soft knits can change a little after the first washes and with wear. Some fabrics relax slightly once they have been worn for a while. Follow the care label and the garment keeps its shape best. If in doubt, choose the size that feels comfortable from day one rather than counting on changes.
When you are still unsure
Sometimes it is simply impossible to decide in advance. Then you can order both sizes, try them at home in peace and return the one that does not fit. Many people do this, and it is an easy way to learn how a particular style fits you. Next time you will know which size to choose.
Frequently asked questions
What about socks between two sizes
Choose the smaller one. A sock that is too large folds in the shoe and can rub, while the smaller one stretches easily over the foot.
Can you order both
Yes, many people do and return the one that does not fit. That way you can try both sizes at home and keep the better one.
What if you are unsure about the fabric
Look at the fibre content in the product description. If it lists elastane, the fabric gives, and the smaller size is usually right.



