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Creating your first shirt with our AI : back length

You are creating your first LE CHEMISEUR® shirt with our AI and would like to check the back length? This page is for you.

The ideal back length for your shirt

The length of your shirt depends on your size, and how you want to wear your shirt.

Casual Shirt, worn outside the trousers :	Formal Shirt, worn inside the trousers :

A casual shirt, worn outside the pants, should cover your stomach even when you raise your arms. It should not be too long either to avoid the "skirt effect". On the side, it extends about 10 cm below the belt. At the front, it reaches the middle of the fly.	A formal shirt must be long enough to stay in place inside the trousers when you move. On the side, the shirt should extend about 17 cm below the belt. At the back, the shirt should reach the base of the buttocks and at the front towards the bottom of the fly.

For a shirt of intermediate length, it is recommended to leave about 15 cm of fabric on the side relative to the belt.

The AI calculates a length adapted to your size and modifies it according to your usage: If you have chosen "shirt worn inside the trousers", the AI adds +2 cm, if you have chosen "outside", it removes -3 cm from the intermediate length.

Trust the AI!

LE CHEMISEUR®'s AI combines years of experience with data from more than 50,000 customers. It works for the vast majority of men, and you are covered by our Fit Guarantee.

🪜 Tall or short men

We recommend that taller people add a little length to the back (to look smaller in comparison) and shorter people reduce the length of the back a little (to look taller in relation to their shirt and avoid visually shortening their legs). This adjustment is already (slightly) done by the AI, but you can amplify it.

🐘 Prominent stomach

Add + 2 cm so the shirt stays tucked. For neck sizes 48 cm or above you automatically benefit from our Big-&-Tall pattern, where the front is slightly longer for any given back length.

How to measure the back length on a shirt you already own

Measure the back length on a buttoned shirt laid flat, from the collar seam down to the hem.

Updated on: 10/12/2025