What to do when you are between two sizes

Short answer: The rule depends on the item. For underwear and socks, size up. For T-shirts and tops, size up if they will be tumble dried, and for close fitting styles without stretch, size up too. The bra band is the exception.

Underwear up

Briefs or boxers that are too small dig in at the edges all day, at the leg and at the waistband. You notice it most when sitting. A pair that is slightly too big can be worn without trouble, because soft stretch fabric adapts to the body. If you are in between, the larger size is almost always better. See bamboo underwear for women.

Socks up

A sock at the top of its size range gets tight over the instep after a few washes. The heel can also slip under the foot, so the sock creeps down in the shoe. Move up to the next range if your shoe size sits right on the border. A sock with a little extra room also lasts longer.

T-shirts by drying method

If you tumble dry, size up, because the shirt shrinks a little, mostly in length. If you hang your laundry, you can stay in the smaller size, as shrinkage is lower. Think about your own washing routine before choosing, since it decides how the shirt fits after a few months. See bamboo T-shirts for men.

Close fitting without stretch up

If there is no elastane in the fabric, it will not give during the day. A close fitting style without stretch feels tighter the longer you wear it. Then you should size up. With stretch, you can stay in the smaller size, because the fabric follows the body and returns to its shape.

The exception is the bra band

With a bra, the opposite applies at the back. A band that is too loose gives no support, and all the weight ends up on the straps, which press on the shoulders. The band should sit firm but not tight and lie level all the way round. If you are in between, choose the firmer band. See bamboo bra without underwire.

Think about how you use it

If a garment is for exercise, sleep or long days, comfort matters more than a snug fit. Here the larger size is often best. If it needs to sit smoothly under other clothes, the smaller one may look neater. Consider when you wear the piece most often, and choose for that.

Measurements rather than letters

If the letter puts you between two sizes, look at the centimetre measurements in the chart. The numbers often show you are closer to one size than the other. Measure your chest, waist and hips, and compare with the specific figures for the model before you decide.

Try both sizes

If you are still unsure, it can make sense to try both sizes at home. Put them on unwashed, move around, sit down and stretch your arms. Keep the one that feels best after a few minutes and exchange the other. That is safer than guessing from a chart alone.

What happens over time

Soft stretch fabric gives a little over time, while cotton and viscose can shrink in a hot wash. A garment that feels slightly tight on day one may fit well after a week. On the other hand, a piece that sits loose from the start can become too big. Keep the fabric in mind when choosing.

Frequently asked questions

Should you size up or down when you are in between?

Size up for underwear and socks, so nothing pinches or digs in. Size down for the bra band, because a loose band gives no support and shifts the weight onto the straps.

Does the drying method matter?

Yes. If you tumble dry, size up, because the garment shrinks a little, mostly in length. If you hang your laundry to dry, the smaller size is often enough.