Bamboo bra size and how to measure under and over the bust

Short answer: You measure under the bust to find the band size and over the fullest part to find the cup size. The difference between the two numbers shows which cup fits. Use a soft tape measure, measure over thin clothing and always compare with the size guide for the individual bra.

What you need

You need a soft tape measure, like the ones tailors use, and preferably a mirror. Wear a thin bra or none, so the numbers do not come out too large. Stand up straight and breathe normally. That gives you an honest number you can use when you compare sizes. See a selection of bamboo bra models.

Measure under the bust

Place the tape measure just under the bust, where the band of the bra should lie. Keep it level all the way round and pull it snug but not tight. Note the number in centimetres. This is the starting point for the band size, and the band carries most of a bra's fit.

Measure over the fullest part

Then measure around the fullest part of the bust, without the tape pulling or sagging. Keep it level and not tilted. Note the number. The difference between this number and the measurement under the bust is used to find the cup size. Measure twice to be sure.

How to use the numbers

Every maker has its own size guide, so always compare your numbers with the guide for the bra you want to buy. The same size at two brands need not fit the same. If you are between two sizes, the description can say whether the model runs small or large.

Bamboo bras and fit

A bamboo bra is made from viscose from bamboo, often blended with elastane, and the fabric gives a little. That can make the fit more forgiving, but it does not replace a good measurement. Elastic and blend decide how much it gives, so read the description and choose by the measurement.

Signs of the wrong size

If the band rides up, it is probably too big. If it digs in, it may be too small. If the cup wrinkles or the bust spills over, the cup size does not fit. Feel whether the straps dig in. These are the most common signs that the size should be adjusted.

When your size changes

Your size can change over time, so measure again if the bra no longer feels right. That is normal and does not mean anything is wrong. Fabric and elastic can also wear, so a bra can feel different after a while. For combinations, look at bamboo knickers.

Washing and care

Follow the care label, use a laundry bag and a gentle programme, and avoid fabric softener and high heat. That keeps the elastic going for longer, and the bra keeps its shape. For daily wear you can also look at bamboo tops for women, which suit the bra.

Frequently asked questions

Should I measure while wearing a bra?

Measure with a thin bra or without, so the numbers do not come out too large. Thick cups or padding can give a misleading result.

How often should I measure?

When the bra no longer feels right, or when you think your body has changed. Measure a couple of times a year to check.

What do I do if I am between two sizes?

Read the description to see whether the model runs small or large, and choose by that. Try one size up or down if you are in doubt.

You can find the full range at Copenhagen Bamboo.