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What is the Fit Key?

The Fit Key

Your Fit Key is a 5-character alphanumeric code that stores the measurements of your shirt (or trousers). It allows you to reorder easily.

The Fit Key is printed flat inside your shirt, along with your Signature.

How to create your first Fit Key with AI?

Simply enter your Weight, Height and Age on the website. The LE CHEMISEUR® AI calculates your optimal fit, based on data from over 20,000 customers like you. Start by choosing a dress shirt and let yourself be guided.

Reordering once you have your first Fit Key is easy. Find your Fit Key inside the collar of your shirt, or in your customer account. If needed, you can adjust your fit before reordering. For example, you can add +1 cm to the chest. It’s easy and precise, since your first shirt serves as the base.

If you change the fit, a new Fit Key will be generated for your new shirt.

Updated on: 17/09/2025