The Fit offered by AI depends on the style chosen (slim, semi-fitted, straight). It's optimized to make you look your best: it's slimmed down to give length to short, wide bodies, or widened to make tall, slim men look stronger.
10 years of research and development, more than 20,000 satisfied customers, each with their own body shape. All this data has allowed us to create a unique AI-based algorithm that calculates your fit simply from your weight, height, and age.
85% of our customers place their first order online,
trusting the AI for their fit.
Since 2014, LE CHEMISEUR® has been innovating in close collaboration with its community of customers, around a hundred of whom have also become investors.
Our goal is to transform the way fashion works. On-demand manufacturing is more eco-friendly, which allowed us to become B Corp certified in 2024. And it allows everyone to have products truly adapted to their body shape, at affordable prices.
On this page, we explain to you with complete transparency how the incredible algorithm developed by LE CHEMISEUR® works.
Founder LE CHEMISEUR®
Automotive supply chain engineer, of German origin, based in Paris
Predicting your measurements
There is a strong correlation between a man's weight, height, and age and his body shape.
Height is mainly related to sleeve and back length.
Weight, adjusted for height, influences the shoulder width, neck size, chest, waist, and hips of the shirt.
Age allows us to predict weight distribution: with age, the chest tends to decrease while the waist increases, the neck size tends to increase, and men generally prefer more comfort.
Accuracy of our AI
The AI manages to predict your fit with great precision. Our return rate is only 5%, and the vast majority of custom fits are successful on the first try.
And if it's not right, you benefit from our Fit Guarantee.
Adjustments are easy and precise because your first shirt serves as a reference for deciding on alterations, and if needed, our experts will assist you free of charge via video conference.
What is Machine Learning?
Machine Learning involves determining mathematical formulas that predict new data from historical data.
Based on customers like you
LE CHEMISEUR® calculates your Fit Key using historical data from 20,000 customers and over 80,000 shirts delivered since 2014.
Guaranteed Result
Our easy-to-use 100 day Fit Guarantee, clear help pages, and, if needed, free and unlimited assistance from our team of experts in Paris (by appointment or via video conference) guarantee that you will get your perfect fit!
Continuously improving fits
Reorders of the same shirt fit, slight adjustments on a new order, or occasional returns all represent data points that allow us to continuously refine our AI.
Machine Learning involves determining mathematical formulas that predict new data from historical data.
Enhancing Your Appearance with Technology.
The dimensions of your customized elements (collar, cuffs, pocket, placket) are automatically adjusted to your body shape, for a flawless look. A strong man, for example, needs a slightly larger collar, and, to our knowledge, LE CHEMISEUR® is the only brand in the world to do this automatically!
Special fit for large sizes
We've developed a Fit for plus-size shirts that automatically applies to collar sizes over 48 cm.
You'll look your best and feel your best, thanks to unique optimizations that can't be found anywhere else. The finishings are embossed, the collar is lowered, two ease pleats are added in the back for greater comfort, the shoulder curve is slightly rounded, the front length is longer and the back is more comfortable.The shoulder curve is slightly rounded, the front length is longer than the back so that the shirt doesn't stick out, and the side seams are shifted to the back to fit your silhouette.
Shrinkage Anticipated
Even high-end fabric shrinks after two or three washes.
Our algorithm adds between 1% and 4% to the shirt measurements, depending on the fabric, during manufacturing. Everything is calibrated so that your shirt reaches the measurements of your Fit Key after shrinking, so you don't have to worry about it!
And if you decide to try our slightly stretch, super comfortable French shirts, note that the algorithm automatically refines the fit—just use your usual Fit Key!
New: AI for trousers
Finally custom trousers that suit you perfectly.
Knee width
Height
For customers with a little tummy, the algorithm raises or lowers the trouser height depending on whether they wear their tummy in or above the pants. For customers who have chosen the "flat buttocks" option, the algorithm lowers the trouser height to avoid sagging at the back.
Tilt
The inclination of the pants depends on the "flat buttocks" or "rounded buttocks" option selected. The algorithm increases the inclination above a certain weight, especially for "belly-up" morphologies. Adjusting the inclination is a real plus, and ensures that the pants don't float.
Knee width
The Fit offered by AI depends on the style chosen (slim, semi-fitted, straight). It's optimized to make you look your best: it's slimmed down to give length to short, wide bodies, or widened to make tall, slim men look stronger.
Height
For customers with a little tummy, the algorithm raises or lowers the trouser height depending on whether they wear their tummy in or above the pants. For customers who have chosen the "flat buttocks" option, the algorithm lowers the trouser height to avoid sagging at the back.
Tilt
The inclination of the pants depends on the "flat buttocks" or "rounded buttocks" option selected. The algorithm increases the inclination above a certain weight, especially for "belly-up" morphologies. Adjusting the inclination is a real plus, and ensures that the pants don't float.
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LE CHEMISEUR® - 22 rue Notre Dame de Nazareth - 75003 Paris France
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