China-to-US/EU Sizing for Reps: Stop Guessing, Measure in CM

Why Chinese and Asian sizing runs small

Sizing labels are regional conventions, not fixed standards. A garment cut for the Chinese domestic market is drafted for a smaller average frame than the US or Western European market, so the same letter maps to less fabric. In practice, a Chinese L frequently lands around a US M, and a Chinese XL around a US L. On slim streetwear cuts the gap can stretch to two full sizes.

This is why so many first rep orders come back too tight. Buyers pick their normal US letter, the factory ships the Chinese equivalent of that letter, and it fits like the size below. The letter did its job by the seller's chart; it just wasn't your chart.

The takeaway is simple: the letter on a Chinese listing tells you almost nothing on its own. What matters is the centimeter measurements printed next to it, which brings us to the only method that consistently works.

The one rule: buy by CM, not by S/M/L

Every legitimate Taobao, Weidian, or 1688 clothing listing includes a size chart with real measurements in centimeters. Those numbers are the truth. The letter is just a label glued on top of them, and labels vary between sellers and between batches. Two different factories can both call something "L" and cut them 4 cm apart in the chest.

So your job is to match the CM numbers, not the letters. Find the garment measurement that matters for the piece (chest for a hoodie, waist for pants, length for a tee) and pick the listed size whose CM value fits your body plus the ease you want. If you like a relaxed hoodie, add a few centimeters of room; if you want it fitted, match closer to your actual body measurement.

One warning: charts list either body measurements or flat garment measurements, and they rarely say which clearly. Garment (flat) measurements are what you want, because they describe the actual piece. When in doubt, compare the listed chest number against a hoodie you own laid flat, not against a tape wrapped around your chest.

How to read a Chinese size chart (the characters you'll see)

Chinese charts use a small, repeating set of characters. Once you recognize them, every listing becomes readable. The core measurements: 胸围 (chest / bust circumference), 衣长 (garment length, shoulder to hem), 肩宽 (shoulder width), 袖长 (sleeve length), 腰围 (waist), 臀围 (hip), and 裤长 (pant length / inseam-to-hem). Size labels appear as 码 or 尺码 (size), and you'll see 均码 meaning one-size / free size.

Most charts are a grid: sizes down the left (S, M, L, XL or 165, 170, 175, 180), measurement types across the top in those characters, and CM values in the cells. The numeric sizes like 170 or 175 refer to a reference height in centimeters, not the garment size, so a "175" is drafted for someone around 175 cm tall.

If a listing shows only body measurements and a recommended height/weight range, treat that range as a rough starting point and still cross-check the CM against a garment you own. Factory batches drift, and the height/weight recommendation is the seller's guess, not a measurement of the item you'll receive.

Let the measurement tool read the chart for you

Decoding characters and doing the CM math by hand is exactly what the size and measurement tool at rep.tools/measurements is built to remove. Paste a product link and it pulls the seller's size chart, translates the Chinese measurement labels, and gives you a per-size fit call instead of a wall of numbers.

It can also work from QC photos. When a chart is missing, vague, or you don't trust it, the tool can size from QC pictures of the actual item, which is useful because the piece you receive is what matters, not the idealized chart. Pair it with the QC photo finder in rep.tools/tools to pull a product's QC pics by link, then let the sizing read those.

The tool splits top length and pant length rather than lumping them, and it factors ease so a relaxed cut and a fitted cut give different recommendations for the same body. It's the fastest way to turn a Chinese listing into a confident size choice, and it's free.

The universal method: measure a garment you already own

This is the single most reliable technique in rep buying, and it needs no size chart at all. Take a piece you own that fits exactly how you want, lay it flat, and measure it in centimeters: chest is armpit to armpit, length is top of shoulder to hem, sleeve is shoulder seam to cuff, waist is edge to edge across the top of pants.

Write those numbers down. When you find a rep listing, compare its CM chart directly against your measured garment. If your favorite hoodie is 58 cm across the chest flat and the listing's "L" is 56, size up; if the "XL" is 60, that's your relaxed fit. You're no longer converting between countries or trusting a letter, you're matching real object to real object.

Keep a short note on your phone with your key numbers for tops, pants, and shoes. It turns every future order into a 30-second check and is the closest thing to a guarantee you'll get in this hobby.

Shoe sizing: measure your foot in mm

For shoes, forget your usual size and measure your foot length. Stand on a piece of paper, mark heel and longest toe, and measure the distance in millimeters (or centimeters). That foot length in mm is what Chinese footwear listings almost always provide, usually as a column mapping foot length to size.

Match your measured foot length to the listing's chart rather than assuming your US size carries over. Rep sneakers can run true, small, or large depending on the model and factory, and the community reputation for a given shoe ("runs half a size small, size up") is a helpful starting point but still just consensus, not a promise. Confirm against the listing's foot-length chart and, when available, against QC photos and comments.

A practical habit: measure both feet and use the longer one, and measure at the end of the day when feet are slightly larger. Half a millimeter of error is nothing; half a size of error is a shoe you can't wear.

Common mistakes and how to avoid them

The biggest mistake is ordering by your US letter and ignoring the chart, which is how tight reps happen. The second is confusing body measurements with garment measurements, which sends you the wrong direction. The third is trusting the seller's recommended height/weight blindly across different item types, since a boxy tee and a slim longsleeve fit nothing alike at the same "L."

Always QC. Batches are community reputation, not guarantees, and measurements can drift between production runs, so the item you get can differ from the chart. Use the QC photo finder to inspect the actual pair or piece, and when a seller posts flat-lay measurement photos in QC, trust those over the listing.

Finally, when you're ready to buy, don't chase sketchy links. Paste any Weidian, Taobao, or 1688 link into the link converter at rep.tools/tools to route it cleanly to KakoBuy, or search the item there directly. Then run the listing through the measurement tool before you commit.

Disclosure: the KakoBuy link is an affiliate link — it costs you nothing and supports rep.tools. Every fact above is stated the same way regardless.

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