The sizes displayed on Zalando do not correspond to a single standard. Each brand applies its own sizing charts, and the same waist measurement can result in a size 38 for one brand and a size 42 for another. Choosing your size on Zalando is therefore less about knowing your usual size and more about understanding how the platform compensates for these discrepancies, and where its tools remain limited.
Size discrepancies between brands on Zalando: what the charts show
The central issue is not the lack of information, but the heterogeneity of the references. Zalando aggregates thousands of European, American, Australian, or Scandinavian brands, each with its own interpretation of sizes.
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| Category | Frequent variation between brands | Risk area |
|---|---|---|
| Tops (t-shirts, shirts) | A Scandinavian size S often corresponds to a French size M | Shoulder width, bust length |
| Jeans | Two size differences possible between an American brand and an Italian brand for the same waist measurement in cm | Thigh width, inseam length |
| Coats | The structured cut (blazer, pea coat) amplifies the discrepancies compared to oversized cuts | Shoulder width, sleeve length |
| Shoes | UK, EU, and US sizes do not convert linearly according to manufacturers | Foot width, toe shape |
These discrepancies explain why relying solely on the label “38” or “M” often leads to returns. The useful data is not the labeled size, but the measurements in centimeters associated with each item.
Zalando now offers specific measurement guides by brand, and sometimes by model. This granularity is particularly marked for jeans, coats, and shoes, where the discrepancies between brands are most pronounced. To cross-reference this data with practical advice, the Zalando size guide provided by Hermaphrodite details the correspondences by clothing category.
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Zalando size recommendation: how the algorithm works
The size recommendation module integrated into Zalando (Fit Finder type) no longer just asks for your usual size. It relies on machine learning models powered by return history, sizing data provided by manufacturers, and measurements declared by users.
Specifically, the algorithm cross-references two types of signals:
- Mass returns on a given item, which reveal whether it runs large or small compared to the standard of its category
- The buyer’s profile (entered measurements, history of kept or returned orders), which refines the prediction over time
- The manufacturer’s technical data (leg length, shoulder width, waist curve), when available
The result displayed on the product page (“This item runs small, we recommend the next size up”) becomes more accurate as the item accumulates return data. A recently launched item will have a less reliable recommendation than a best-seller that has been available for several seasons.
What the algorithm does not capture
Individual morphology remains a blind spot. Two people with the same bust measurement may have very different shoulder widths. The module also does not take into account cut preferences: wearing slim jeans or straight jeans changes the relevant size for the same waist measurement.
Customer reviews that mention the cut (“runs small in the thighs”, “sleeves too long for my size”) remain a complementary source of information that the algorithm alone cannot replace.
Measuring yourself: the important measurement points
Entering your measurements in your Zalando profile improves the algorithmic recommendation. However, you need to measure the right areas, using the correct method.
- Bust measurement: tape measure horizontal, passing under the armpits and over the widest part of the bust, without tightening
- Waist measurement: at the level of the navel, standing, without sucking in the stomach (the “natural” measurement is always more reliable)
- Hip measurement: at the widest part of the hips and buttocks, feet together
- Inseam length: from the crotch to the floor, barefoot, for pants and jeans
These four measurements cover the majority of cases. For shoes, measuring the length of the foot in centimeters (from heel to big toe) provides a more usable result than the usual shoe size, especially for brands where the EU conversion differs from the French standard.
Return policy and bracketing: what has changed on Zalando
Ordering multiple sizes of the same item to keep just one (bracketing) has long been the default solution. Since 2023-2024, Zalando is actively communicating about reducing returns for environmental reasons.
In some European markets, the platform is testing deterrent signals for customers who return a high proportion of their orders. This evolution changes the purchasing strategy: betting on a single well-chosen size becomes more relevant than ordering three variants.
Using free returns without abusing them
Returns remain free in France for now. However, a profile with a very high return rate could, in the long run, see its experience modified. Taking the time to consult the specific measurement guide for the item, reading the first three or four customer reviews on the cut, and cross-referencing this information with your own measurements significantly reduces the risk of return.
Choosing the right size on Zalando relies less on intuition and more on three verifiable data points: your actual measurements in centimeters, the technical sheet of the item being consulted, and the feedback from previous buyers on the cut. When these three sources converge, the error rate decreases significantly.