Why do you base size recommendations on body measurements instead of product measurements?

Let’s consider the following 3 products and their measurements:

Chart

One of the models we use for fitting tests has the following measurements:

  • Height: 182cm
  • Weight: 75kg
  • Chest circumference: 97cm

For our example, we will focus on the products chest circumference only:

  • Puffer jacket: 108cm
  • Sweatshirt oversize: 126cm
  • Shirt: 109cm

Using those measurements, the size M would not fit our model with a chest of 97cm for any of those products.
In reality the correct size for that person is size M in all cases.

The reason why we cannot use product measurements is because they may vary from one product to the next, while the fit remains the same. 

It is therefore impossible to know the fit of any product without trying it on to understand the body measurements limits for each size.