Ordering clothing online and receiving a piece that is too tight or too loose remains one of the most common reasons for returns. Size 42, whether for a woman or a man, does not refer to exactly the same measurements depending on the country, brand, or type of clothing. Understanding what this size entails can help avoid unpleasant surprises, especially when juggling between a French pant, an American jean, and an Italian shirt.
Thigh circumference and size 42: the reference that guides forget
Most size charts are limited to three measurements: bust, waist, and hip circumference. These data are sufficient for a top or a skirt, but they leave a blind spot when it comes to fitted pants or slim jeans.
A French morphological scale published in 2026 by RaceplanApp introduces an additional reference: the average thigh circumference for each size. For a woman in French size 42, this thigh circumference is given as 56 cm. This figure explains why two people wearing the same size 42 in waist measurement can have very different results with the same pants: the cut at the thigh makes all the difference.
Before buying pants online, measuring the thigh circumference at the widest point (about 5 cm below the groin) allows you to cross-reference this data with the size 42 waist guide and significantly reduce the risk of error.
Size 42 women: international equivalents to remember
Have you ever noticed that a French 42 does not correspond at all to an American 42? Sizing systems vary from country to country, and confusion is common. Here are the main equivalents for women’s size 42, as listed in the size conversion guides updated in 2026.
| Country | Equivalent Size |
|---|---|
| France | 42 |
| United States (US) | 10 |
| United Kingdom (UK) | 14 |
| Germany (DE) | 40 |
| Italy (IT) | 46 |
| International Size | XL |
The French size 42 corresponds to an international XL in most current charts. This classification has evolved: long considered the boundary between standard and plus sizes, size 42 is now included in the XL segment by recent grading guides, without crossing into the “plus size” category.
Typical measurements for a women’s 42
The usual ranges for ready-to-wear French size 42 for women are as follows:
- Bust circumference: between 96 and 101 cm, measured horizontally at the fullest part of the bust
- Waist circumference: between 72 and 80 cm depending on the brands, measured at the natural waistline, without sucking in the stomach
- Hip circumference: between 100 and 108 cm depending on the brands, measured at the widest part of the hips
These references come from standard ready-to-wear scales. They serve as a base, but each brand applies its own interpretation.
Size 42 men: jeans, pants, and shirts
For men, size 42 refers to very different clothing depending on whether we are talking about pants, jeans, or shirts. The confusion arises from the fact that the number 42 does not refer to the same measurement from one garment to another.
Pants and jeans for men in size 42
For men’s pants, French size 42 corresponds approximately to a W32 in the American system (the “W” stands for Waist, meaning the waist measurement in inches). This system, inherited from American jeans, is used by many pant brands beyond denim.
But be careful: a W32 from one brand may fit differently from another. This is vanity sizing, the practice of displaying a size slightly smaller than reality to flatter the customer. Two jeans labeled W32 can have several centimeters of difference at the waist.
The inseam length (the “L” for Length) is a second parameter not to be overlooked. A W32 L32 and a W32 L34 have the same waist size but not the same leg length. To know yours, measure from the top of the inner thigh to the ankle.
Shirt for men in size 42
For a shirt, size 42 refers to the neck circumference in centimeters. A size 42 collar corresponds to a neck of about 42 cm in circumference, which generally means an XL size in letter sizing systems. This number has nothing to do with the 42 of pants.
Why size 42 varies from brand to brand
There is no mandatory standard requiring clothing brands to adhere to identical measurements for the same size. Each brand defines its own scales, which explains why a size 42 from a fast fashion brand may correspond to a size 40 or 44 elsewhere.
Several factors amplify these discrepancies:
- Vanity sizing, which leads some brands to underestimate the displayed size to encourage purchases
- The target market: a brand targeting a young and slim audience will have a narrower 42 than a brand positioned for comfort
- The country of design: Italian, American, and French scales do not start from the same morphological bases
- The type of clothing: a 42 in a flowing dress is more forgiving than a 42 in slim pants
Taking your actual measurements remains the only reliable method. A measuring tape, three minutes, and the right areas to measure (bust, waist, hips, thigh, inseam for bottoms, collar for shirts) can avoid most online ordering errors.
Rather than relying on the number displayed on the label, comparing your measurements to the brand’s size chart yields a much more accurate result. This habit also reduces returns, a logistical and ecological issue that brands are increasingly taking seriously.
