Years ago on a trip through Asia I bought a shirt marked L, tried it on back at the hotel, and discovered it fit like something I had owned in high school. I have been a fairly consistent size for most of my adult life, or so I thought.
The truth is that clothing sizes only look like a universal language. Every region speaks its own dialect, and the dialects have been drifting apart for decades.
Numbers that mean different things
Unlike shoes, where at least a foot length sits underneath, clothing sizes compress chest, waist, hips and height into a single code, and different countries compress differently.
A US women’s 8, a UK 12 and an EU 40 are often listed as equivalents, yet each system got to its number its own way. EU sizes are loosely tied to body measurements in centimeters, while US and UK sizes are legacy scales whose link to actual inches faded long ago. Men’s shirts seem more honest, since a 16 collar really does mean about 16 inches, but a European 41 collar is the same neck measured in centimeters.
Then there is vanity sizing. Over the years many brands have quietly enlarged their garments while keeping the label the same, so a modern size 8 can be cut noticeably bigger than a size 8 from a few decades back. I own trousers with the same number on the tag spanning years of my life, and they are not the same trousers.
Letters are even vaguer
S, M and L feel simple, but they are the least standardized codes of all. An Asian-market L frequently corresponds to a European M or S, because the letter scales are calibrated to different typical body sizes — which explains my hotel-room surprise.
Fast-fashion chains sometimes recalibrate letters per market, while others ship identical garments worldwide, so two L shirts in the same shop may fit completely differently depending on where they were designed.
Shop with a tape measure
The escape from this maze is the same as with shoes: trust centimeters and inches, not codes. A few habits that have saved me from bad orders:
- Measure your chest, waist and hips, and keep the numbers in your phone in both cm and inches
- Lay a garment that already fits you well flat, measure it, and keep those numbers too
- Check the size chart on every site, every time — not once per country
- Read reviews for phrases like runs small or runs large
Most online retailers now publish garment measurements or body-measurement tables for each product, and comparing numbers beats comparing letters every time. When a listing offers only S, M, L with no chart, treat the size as a guess, because that is what it is.
Sizes are marketing, but measurements are physics, so carry your own numbers and let the labels say whatever they like.
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