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Cotton On Size Chart

Australian fast fashion · women's

Cotton On is an Australian brand using AU/UK numeric sizing from 4 to 24, with an alpha overlay from 3XS to 5XL, and a centimetre-native chart. A size 10 (Small) fits a 90cm bust, 72cm waist and 98cm hip. The useful thing to know about Cotton On is that it treats AU and UK numbers as identical (an AU 10 is a UK 10), and publishes a single unified women's chart, so there is no UK offset to worry about. Cotton On's own guidance is to choose the larger size when you fall between two, because many of its tops, tees and dresses are cut on the relaxed, casual side. The brand also carries one of the broader size ranges on the high street, running to a 24. As a high-volume secondhand brand, Cotton On's tags are reliable; measure the garment flat against the chart and lean to the larger size for fitted styles.

Cotton On uses AU/UK numeric sizing (4–24) with an alpha overlay (3XS–5XL), and publishes an official AU/US/EU conversion. Its chart is centimetre-native.

Cotton On body measurements

SizeLetterBust (cm)Waist (cm)Hip (cm)
62XS806288
8XS856793
10S907298
12M9577103
14L10183109
16XL10789115

Cotton On international size conversion

AUUSUKEU
62634
84836
1061038
1281240
14101442
16121644

How Cotton On fits

Cotton On treats AU and UK numbers as identical and cuts many tops, tees and dresses on the relaxed side. Its own guidance is to choose the larger size when between two — the brand also runs one of the broader size ranges on the high street.

Cotton On sizing — frequently asked questions

Is Cotton On AU sizing the same as UK?

Yes — Cotton On uses a single unified women's chart where the AU and UK numbers are identical, so an AU 10 is a UK 10 with no offset. The official conversion maps that to a US 6 and an EU 38.

Does Cotton On run big or small?

Cotton On cuts many of its tops, tees and dresses on the relaxed, casual side, and its own size guide recommends choosing the larger size when you fall between two. For a closer fit on a fitted style, measuring the garment flat against the chart is the safest check.

What is a Cotton On size 10 in cm?

A Cotton On size 10 (Small) fits a 90cm bust, 72cm waist and 98cm hip on the brand's centimetre-native chart. Cotton On carries a broad range from AU 4 up to AU 24, so extended sizes follow the same grading.

How to measure Cotton On against your own wardrobe

The most reliable way to check fit is to compare Cotton On's chart above to an item you already own. Lay it flat and measure in centimetres — see the full how-to-measure guide for step-by-step instructions.

How to measure a top or dress, laid flatA flat-lay outline of a top showing where to measure the shoulder (seam to seam across the back), bust or chest (underarm seam to underarm seam), waist (across the narrowest point), sleeve (shoulder seam to cuff) and length (high shoulder point to hem).ShoulderBust / chestWaistLengthSleeve
Tops & dresses — measure flat, then double the bust, waist and hip figures for the full circumference.
How to measure bottoms, laid flatA flat-lay outline of a pair of trousers showing where to measure the waist (across the waistband), hips (across the widest point), rise (waistband down to the crotch seam), length (top of the waistband down the outside leg to the hem) and inseam (crotch seam straight down to the bottom of the leg).WaistHipsLengthRiseInseam
Bottoms — measure flat, then double the waist and hip figures for the full circumference.
How to measure a dress, laid flat with straps upA flat-lay outline of a dress showing where to measure the chest (underarm seam to underarm seam), waist (across the narrowest point), hip (across the widest point) and length (top of the strap or shoulder straight down to the hem).ChestWaistHipLength
Dresses — lay flat with straps up, then double the chest, waist and hip figures for the full circumference.
How to measure shoes, by insole lengthAn outline of a shoe sole showing the insole length measurement, taken as a straight line from the back of the heel to the tip of the longest toe.Insole length
Shoes — place the shoe on a flat surface or a sheet of paper, trace around the sole, then measure heel to toe in a straight line.

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Last verified: June 2026. Source: cottonon.com.

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