How to measure a top you already own

Short answer: Lay the top flat on a table, smooth it out and measure the width across the chest, the length from shoulder to hem and the sleeve length. Three measurements are enough to compare with a size guide before your next purchase.

The fabric must lie completely flat

Folds and ripples give measurements that are several centimetres off. Lay the top on a table or floor and smooth it from the centre outwards. Do not pull the fabric, just let it lie naturally. The same applies when you measure bamboo joggers for women or other soft items.

Measure the width and double it

Width across the chest is measured edge to edge, two centimetres below the armhole, then doubled to get the circumference. The top lies double, so the flat measurement is only half. The same rule applies to all flat measured clothing, including bamboo sweatpants for women, where you measure waist and hips.

Length from shoulder to hem

Length is measured from the highest point of the shoulder, where the seam meets the neck, straight down to the hem. Do not follow the curve of the fabric. This measurement decides whether the top covers the hips or stops at the waist. Write it down alongside the width.

Sleeve length completes the picture

Measure the sleeve from the shoulder seam to its hem with the sleeve laid straight. If the top has raglan sleeves without a shoulder seam, measure from the neckline instead. A bent sleeve gives too short a figure, so straighten it first. With width, length and sleeve you have enough for most guides.

Note the measurements

Write the figures down with the name of the item, so they are ready next time. A note on your phone is enough. If you have several tops you like, measure them all and see where they match. It saves returns on all bamboo sweatwear and gives you a steady reference point.

Use the right tool

A soft tape is easiest because it follows the fabric without slipping. A ruler works too if you keep it straight. Always measure in centimetres so you can compare directly with the guide. Check each measurement twice and use the figure that repeats.

Compare with the guide

With your three measurements, find the guide for the item you want. Look at the width first, as it decides how the top sits on the body. Then check length and finally sleeve. If the guide is close to your favourite top, you are on safe ground, otherwise consider another size.

Think about the fabric

A top in soft fabric with some stretch can fit well even if it measures slightly smaller than your favourite. Firm fabric gives less, so every centimetre counts more. Read whether the item is described as loose or close fitting, and remember that washing as the label says helps keep the fit.

Frequently asked questions

Where do you measure the width

Two centimetres below the armhole, straight across from edge to edge, with the fabric smoothed out fully.

Should you stretch the fabric

No, measure it as it lies without pulling, or the figure will be larger than the top really is.

How many measurements are enough

Three: width, length and sleeve length. Together they give a good picture of how the top fits you.