How to Take Body Measurements for Accurate Clothing Sizes

A “size 10” from one clothing brand and a “size 10” from another can fit completely differently — not because either brand made a mistake, but because clothing size labels are not standardized across manufacturers or countries the way, say, a kilogram is standardized everywhere. The most reliable way to find your size in an unfamiliar brand or country’s sizing system is to measure your body directly and compare those measurements (in centimeters or inches) to the brand’s own size chart.

The core measurements

Almost all clothing size charts are built around three or four key body measurements:

• Bust/chest: measured around the fullest part of the chest, with the tape measure horizontal and level around the back.
• Waist: measured around the natural waistline — typically the narrowest part of the torso, roughly level with the navel for most people, not where pants happen to sit.
• Hips: measured around the fullest part of the hips and buttocks, with the tape horizontal.
• Inseam (for trousers): measured from the crotch seam to the bottom of the leg, usually along the inside seam of a well-fitting pair of pants.

For shirts and jackets, shoulder width, arm length (from shoulder seam to wrist), and neck circumference (for dress shirts, measured at the base of the neck) are also commonly used.

How to measure accurately

1. Use a flexible tape measure, not a rigid ruler — body measurements need to follow curves.
2. Measure over light clothing or undergarments, not bulky clothing, for the most accurate result.
3. Keep the tape level and snug but not tight — the tape should sit against the body without compressing it.
4. Stand naturally — don’t hold your breath or pull your stomach in for the waist measurement; a size chart is meant to fit your normal posture, not a held one.
5. Measure twice and use the larger of the two readings if they differ slightly — clothing that’s slightly looser is generally more comfortable than clothing that’s slightly tighter.

Record all measurements in centimeters and inches if you can, since different brands’ charts use different units — having both on hand means you won’t need to convert under time pressure while shopping. The cm to inches converter is useful for quickly double-checking a chart that only lists one unit.

Why “size 10” isn’t a fixed measurement

Clothing size numbers (like US sizes 0–20, or UK sizes 6–20) are labels each brand assigns to a range of body measurements — there is no regulatory body that defines what a “size 10” must measure, unlike, say, a liter, which is precisely defined everywhere. This is sometimes called “vanity sizing,” where brands have shifted their size labels over decades (a modern size 8 in many brands corresponds to measurements that an older size chart might have labeled a 12 or 14), generally trending toward smaller numbers for the same measurements.

Because of this, your size in centimeters or inches is far more portable across brands and countries than your size in any brand’s numbered system. A brand’s size chart will list a range of measurements for each labeled size — find your actual measurements first, then look up which labeled size corresponds to them in that specific brand’s chart.

International size systems

Clothing sizing also varies by country/region in ways that don’t follow a simple offset:

• US sizing for women’s clothing typically runs roughly 2 sizes smaller in number than UK sizing for a comparable fit (a US 8 is roughly a UK 10), though this varies by brand and category.
• EU sizing uses a different numbering scheme entirely (often based loosely on centimeter chest/bust measurements, e.g., EU 36, 38, 40…), which doesn’t align with either US or UK numbers via a fixed offset.
• Men’s sizing for shirts is often given directly in measurements (neck circumference in inches or cm, e.g., “15.5 inch collar”), which is more portable across brands than the small/medium/large labels, but those labels also vary in actual measurements between brands.

Because none of these systems share a fixed conversion factor, the same advice applies as with shoe sizes: measure yourself in centimeters, then check the specific retailer’s size chart for your measurements rather than assuming “my UK size translates to this US size” across the board.

Practical takeaway

1. Take your own measurements (bust/chest, waist, hips, inseam, and for shirts, neck/arm length) in centimeters and inches.
2. When shopping a new brand or country’s sizing, find that brand’s specific size chart — not a generic international conversion table — and match your measurements to it directly.
3. Re-measure periodically; body measurements change over time, and a size that fit a year ago may no longer correspond to the same label in a brand’s current chart.

Once you have your measurements, our women’s and men’s clothing size charts give you a quick lookup across US, UK, and EU sizing.