How to measure a garment you already own

Short answer: The most reliable way to find a size is to measure a piece of clothing you already like. That way you compare numbers with numbers instead of guessing from a letter.

Choose a piece you like

Start by finding a garment that fits exactly the way you want. Ideally it should be the same type as the one you plan to buy, such as a sweatshirt if you are looking for a new sweatshirt. Pick one that has been washed a few times, because it then shows the fit you actually wear.

Lay it flat without stretching

The fabric should lie completely flat without being pulled in any direction. Place the garment on a table, close any buttons or zip and smooth out the folds by hand. Do not pull at the edges to make it look neat, as that makes the numbers too large. Soft bamboo underwear for women gives easily when pulled.

Measure the width and double it

The width across the chest times two gives the circumference of the garment. Measure straight across the chest just below the armholes, from side seam to side seam. The number is half the circumference, because you only measure the front. Double it, and you can hold it against a size guide.

Measure the length

Length is measured from the highest point at the shoulder, where the shoulder seam meets the collar, straight down to the bottom edge. Keep the tape straight and do not follow the curve of the fabric. Length tells you a lot about how the garment falls and whether it covers you when you move.

Sleeves and other measurements

If sleeve length matters to you, measure from the shoulder seam to the cuff. For trousers, lay the waistband flat and double the width, and measure the leg from the crotch seam to the hem. The more measurements you have, the better you can compare, but width and length are the place to start.

Compare with the guide's numbers

Most size guides give the measurements of the garment, not of the body. That matches your numbers well, because you also measured a garment. Hold your numbers against the guide and choose the size that comes closest. This applies to bamboo sweat clothes as well as other pieces where fit matters.

Compare the same type of garment

A measurement from a T-shirt says little about a sweatshirt, because the two are cut for different purposes. Try to measure a piece similar to the one you want to buy. For small items like bamboo socks for women your shoe size is enough, but for tops and trousers a similar piece helps.

Write the numbers down

Note the measurements along with which garment they come from. Then they are ready the next time you shop, and you do not have to lay the clothes out again. Add a short note about what you like about the fit, so you remember whether you want a little more or a little less room next time.

Frequently asked questions

Why measure a garment you own

Because you then compare numbers with numbers. It is far more precise than guessing from a letter size, which means something different from brand to brand.

How do you measure the width

Lay the garment completely flat and measure across the chest just below the armholes. Double the number to get the circumference, and do not stretch the fabric.

What if the guide shows body measurements

Then measure yourself instead. Always check whether the guide's numbers refer to the garment or the body, because they are not the same.