Sizing is the single biggest reason clothing orders go wrong on AliExpress, and it's almost never about quality — it's that Chinese sizing and Western sizing are built around different bodies entirely, and the letter on the label doesn't translate the way you'd assume.
In this guide
Why the sizes feel wrong
Chinese sizing standards are built around the average build of the Chinese population, which runs smaller and slimmer on average than US or European sizing standards. The practical result: a size labeled Large in Chinese sizing often fits closer to a Small or Medium in US or EU terms. This isn't a quality problem or a sign a specific seller got it wrong — it's a genuinely different baseline, consistent across most Chinese-manufactured clothing, not just AliExpress specifically.
Why you can't trust S/M/L
Letter sizes aren't standardized between regions the way a lot of buyers assume. An "M" on one listing and an "M" on another — even both manufactured in China — can correspond to genuinely different measurements. Treat the letter as a rough category, not a size, and go straight to the specific measurement chart on the product page instead, which is usually given in centimeters.
How to actually measure yourself
Use a soft measuring tape, not a rigid one, and measure the parts that actually matter for the garment:
- Tops and dresses: bust, waist, and hips.
- Jackets and outerwear: shoulders and chest specifically — these run tighter on Chinese sizing than Western buyers often expect.
- Pants and jeans: waist and inseam. Chinese-manufactured jeans in particular tend to run 1–2 sizes smaller in the waist, with shorter inseams than Western standards.
Compare your numbers directly against the listing's own measurement chart — not a generic conversion chart, since sizing can vary between individual sellers even within Chinese sizing conventions. The chart on that specific product page is the only number that's actually accurate for that specific item.
Using reviews as a second check
Buyer reviews are worth reading specifically for sizing feedback before you order — the star rating won't tell you this, but the comments often will. Look for reviewers who mention their usual size and how this item compared, and check whether the review includes their country, which gives you a rough sense of what sizing convention they're used to. A review that says "runs small, ordered a size up" from multiple different buyers is a more reliable signal than the label on the listing itself.
Frequently asked questions
Does AliExpress clothing run small?
Generally yes. Chinese sizing is based on the average build of the Chinese population, which tends to run smaller and slimmer than US or European averages. A size labeled Large in Chinese sizing is often closer to a Small or Medium elsewhere.
Should I trust the S/M/L size on an AliExpress listing?
Not on its own. Letter sizes aren't standardized between regions, so an M in Chinese sizing isn't the same as an M in US or EU sizing. Use the specific measurement chart on the product page instead, and compare it against your own measurements rather than the label.
How do I measure myself correctly for an AliExpress order?
Use a soft measuring tape and measure bust, waist, and hips for most tops and dresses, or shoulders and chest for jackets and outerwear. Compare those numbers directly against the listing's measurement chart in centimeters — not the letter size — since that's the only number that's actually specific to that item.
If you're weighing AliExpress against a fashion-focused platform like Shein for a clothing purchase specifically, our platform comparison covers that trade-off directly.
