Men's shirt size is determined primarily by three measurements: neck circumference, shoulder width, and sleeve length. Taken correctly, these three pieces of information are sufficient to choose a shirt that fits well, without approximation. This guide explains how to take them at home, alone or with help.
Why generic sizes are not enough
An S, M, or L says nothing about neck circumference or sleeve length. Two men wearing the same generic size can have very different body types: one with broad shoulders and a slim neck, the other with a thicker neck and narrower shoulders. This is why quality shirts are often offered with measurements in centimeters, which are more precise and reliable.
If you're hesitating between two sizes or ordering a shirt online, knowing your exact measurements is the only way to avoid disappointment upon receipt.
The three essential measurements
1. Neck circumference
This is the most crucial measurement for a button-down shirt. Place a measuring tape flat around the base of your neck, where the collar usually rests. Add one to two centimeters to ensure the collar is comfortable when buttoned, without being too tight.
A collar that is too tight creates immediate and visible discomfort. A collar that is too loose makes the tie or open collar look untidy.
2. Shoulder width
Measure from one shoulder seam to the other across the back. This measurement determines how the shirt fits across the upper body. A shoulder seam that slips down the arm looks sloppy, even on a beautiful fabric.
3. Sleeve length
With your arm slightly bent, measure from the middle of your nape to your wrist, passing over the top of your shoulder. Some brands indicate only arm length (from the hollow of the shoulder to the wrist): check which reference is used in the size guide.
Indicative size conversion chart
| Generic size | Neck circumference (cm) | Shoulder width (cm) |
|---|---|---|
| S | 37 – 38 | 43 – 44 |
| M | 39 – 40 | 45 – 46 |
| L | 41 – 42 | 47 – 48 |
| XL | 43 – 44 | 49 – 51 |
These ranges are indicative. Always consult the specific size guide for each brand, as cuts can vary significantly from one collection to another.
Regular fit, slim fit, or tailored fit: what changes
For the same neck circumference, a regular fit shirt offers more volume in the torso and hips; a slim fit is more tapered. The choice depends on your body type and the intended use: a shirt worn tucked into suit pants doesn't require the same fit as a shirt worn untucked on the weekend.
At Benjamin Jezequel, the fits are designed to adapt to a masculine silhouette without being too tight or too voluminous. Consult the size guide available on each product page of our shirt collection.
Some practical tips
- If you are between two sizes, choose the larger one for collar comfort.
- A shirt well-fitted at the shoulders can be altered at the waist by a tailor; the opposite is more difficult.
- Measure yourself preferably in underwear or with a single light layer, with the measuring tape flat against your body.
- Measurements taken in the morning are often more reliable than at the end of the day.
Frequently asked questions
Can you measure yourself?
For neck circumference, yes, without difficulty. For shoulder width and sleeve length, a second pair of eyes is helpful to ensure the measuring tape is correctly positioned across the back. Failing that, an existing shirt that fits you well can serve as a reference: measure it flat.
What's the difference between a size 40 shirt and a size M?
Size 40 corresponds to the neck circumference in centimeters, a system traditionally used in Europe for dress shirts. Size M is a generic size that aggregates several measurements. For a quality shirt, the centimeter notation is more precise and preferable.
How to choose between two sizes if I'm in between?
Opt for the larger size if your neck circumference is close to the upper limit, or if you wear the shirt with a jacket. Choose the smaller size if you wear it alone and prefer a sharper fit. In case of doubt, the product page of each Benjamin Jezequel shirt specifies the exact dimensions by size.
