Buying a size M t-shirt in Mexico and receiving a garment that is too large compared to your French M is a common mishap. The Mexican and French sizing systems are based on different logic, and the discrepancies are not simply a matter of a one-size shift. Understanding how each country constructs its size charts can help avoid mistakes, whether you are ordering online from Paris or shopping in Mexico City.
Mexican size and French size: two systems that don’t speak the same language
In France, women’s clothing sizes are expressed in even numbers (36, 38, 40, 42…) and are based on measurements in centimeters: bust, waist, and hip circumference. Men’s sizes follow a similar logic.
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In Mexico, the system is different. Women’s sizes use numbers like 28, 30, 32, 34, 36, which correspond to measurement ranges specific to the local market. The letters S, M, L, XL coexist with these numbers, and some Mexican brands add the designation “CH” (chica), “M” (mediana), or “G” (grande).
The trap is that these numbers sometimes resemble European sizes without corresponding to them. A Mexican size 32 for women has nothing to do with a European 32. Knowing the size equivalence Mexico France for clothing before purchasing remains the most reliable precaution to avoid mistakes.
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Mexican vanity sizing: why your measurements are not enough
Have you ever noticed that a garment labeled “M” can be loose with one brand and fitted with another? This phenomenon has a name: vanity sizing. And it is more pronounced in Mexico than in France.
Vanity sizing involves assigning a smaller size on the label for actual larger measurements. The commercial goal is simple: the customer feels flattered to fit into a smaller size. In Mexico, this practice is common, which means that a garment labeled “M” in Mexico often corresponds to more generous measurements than its French equivalent.
The concrete result: a size M in Mexico often corresponds to a size S in the United States, and the discrepancies with France follow a similar logic. If you wear a French 38, do not rely on the number printed on the Mexican label. Take your measurements in centimeters and compare them to the brand’s guide.
Measurements in centimeters as a universal reference
Several major international brands have understood the problem. They now display a triple indication on their product sheets: the local size (28, CH/M/G for Mexico), the measurement in centimeters (bust, waist, hips), and sometimes an international equivalent.
This triple indication is your best ally. A bust measurement of 88 cm remains 88 cm, whether you are in Lyon or Guadalajara. Measure yourself in centimeters before each international purchase, and look for this data on the product sheet rather than relying solely on letters or numbers.
Shoe size correspondence Mexico-France
Shoes pose a distinct problem. In France, the European shoe size system is used (36, 37, 38…). In Mexico, the size directly corresponds to the length of the foot in centimeters.
This is good news. If you know the length of your foot, you know your Mexican shoe size. A foot measuring 24 cm gives a size MX 24, which is a European 38. No need to go through intermediate conversions to US or UK sizes.
To measure your foot correctly:
- Place it flat on a sheet of paper, heel against a wall, and mark a line at the tip of your longest toe
- Measure the distance between the wall and the line in centimeters, preferably at the end of the day when your foot is slightly swollen
- Add about half a centimeter for walking comfort, especially for closed shoes
This centimeter-based system shared with Japan makes the Mexico-France conversion simpler for shoes than for clothing.
Shopping online between the two countries: reflexes to adopt
Ordering a Mexican garment from France (or vice versa) without trying it on requires a method. The generic conversion charts found online provide an indication, but the difference between two sizes of the same brand can exceed two centimeters for the same label.
Here are the reflexes that reduce the risk of error:
- Look for the brand-specific size guide, not a generic chart. Size correspondences vary from one manufacturer to another
- Prefer sites that display measurements in centimeters in addition to the local size
- If the Mexican brand only indicates sizes in letters (S, M, L) or numbers (28, 30, 32), contact customer service to obtain the actual measurements of the garment
- Check the return policy before ordering. An international return is costly if the size does not fit
The case of unisex and oversized clothing
Oversized cuts, prevalent in both Mexican and French fashion, further blur the lines. An oversized size M Mexican t-shirt can fit like an L or XL French one depending on the brand. Ask for the flat dimensions of the garment (shoulder width, total length) rather than relying on the size letter.
Unisex clothing generally follows men’s size charts. If you are a woman used to a French 38, a unisex size S may be too wide at the shoulders. Again, only measurements in centimeters can help you decide.
The common thread remains the same regardless of the type of garment: centimeters do not lie, labels do. Take your measurements once, note them down, and systematically compare them to the brand’s guide rather than your usual size. This is the only reliable way to navigate between two sizing systems that were never designed to communicate.