The Perfect Fit: How to Measure Yourself for a Shirt at Home
The difference between a shirt that looks good and a shirt that looks exceptional is almost always fit. Not the brand, not the fabric, not the colour — the fit. A well-fitted shirt in a modest fabric will consistently outperform an expensive shirt in the wrong size, and the only way to ensure correct fit when buying online is to know your measurements precisely.
Most men do not know their shirt measurements. They know their collar size — usually from a shirt they bought years ago — and they guess at everything else. The result is a wardrobe full of shirts that fit adequately but not correctly: collars that gap, chests that pull, sleeves that are too long or too short. Here is how to measure yourself correctly at home, with nothing more than a tape measure and five minutes.
What You Need
A flexible fabric tape measure — the kind used for sewing, not a rigid metal builder's tape. If you do not own one, they are available from any haberdashery or online for under £2. You will also need a well-fitted shirt to use as a reference for some measurements, and ideally a second person to help with the measurements that are difficult to take alone.
Measurement 1: Collar (Neck)
The collar measurement is the most important shirt measurement and the one most men get wrong. The common mistake is measuring the collar of an existing shirt rather than the actual neck — which means that if the existing shirt's collar was wrong, the new shirt's collar will be wrong in the same way.
How to measure: Wrap the tape measure around the base of your neck, where the collar of a shirt would sit. Keep the tape snug but not tight — you should be able to slide one finger between the tape and your neck. Note the measurement in centimetres. Add 1–1.5cm to this measurement to allow for comfort and movement. This is your collar size.
What it affects: A collar that is too tight will be uncomfortable throughout the day and will cause the collar to gap when buttoned. A collar that is too loose will look sloppy and will not hold a tie knot correctly.
Measurement 2: Chest
The chest measurement determines how the shirt fits through the upper body — whether it pulls across the chest when buttoned, hangs loosely away from the body, or sits correctly with a small amount of ease.
How to measure: Wrap the tape measure around the fullest part of your chest, keeping it horizontal and parallel to the ground. Keep your arms relaxed at your sides. Do not pull the tape tight — it should sit snugly against the body without compressing it. Note the measurement. Add 10–12cm to this measurement for a slim fit shirt; add 14–16cm for a regular fit.
What it affects: A chest that is too small will pull at the buttons and create horizontal stress lines across the fabric. A chest that is too large will hang away from the body and look shapeless.
Measurement 3: Waist
The waist measurement determines how the shirt fits through the midsection — whether it is fitted and defined or loose and boxy.
How to measure: Wrap the tape measure around the narrowest part of your torso, typically 2–3cm above the navel. Keep the tape horizontal and snug without compressing. Note the measurement. Add 10–12cm for a slim fit; add 14–16cm for a regular fit.
What it affects: A waist that is too tight will restrict movement and cause the shirt to pull when you sit or reach. A waist that is too loose will create excess fabric that bunches when tucked and billows when untucked.
Measurement 4: Sleeve Length
Sleeve length is the measurement that most men get wrong most consistently — and the one that is most immediately visible when incorrect. A sleeve that is too long covers the hand; a sleeve that is too short exposes too much wrist and looks undersized.
How to measure: Start at the centre back of the neck, at the point where the collar seam would sit. Measure across the shoulder to the shoulder point — the bony tip of the shoulder — and then down the arm to the wrist bone. Keep the arm slightly bent at the elbow, as it would be in a natural resting position. Note the full measurement from centre back to wrist.
What it affects: The correct sleeve length allows approximately 1.5–2cm of shirt cuff to show below the jacket sleeve. A sleeve that is too long will bunch at the wrist; a sleeve that is too short will disappear inside the jacket sleeve entirely.
The Men's White Slim Fit Plain Long Sleeve Shirt is the ideal shirt to use as a fitting reference once you have your measurements. The slim fit construction follows the body correctly when the measurements are right — and immediately reveals when they are not, which makes it the most useful shirt for calibrating your size across the Wessi range.
Measurement 5: Shoulder Width
The shoulder measurement is the most critical of all — because unlike the chest, waist, and sleeve, the shoulder cannot be altered by a tailor without significant cost and complexity. If the shoulder fits correctly, everything else can be adjusted. If the shoulder is wrong, the shirt will never fit correctly regardless of what else is done to it.
How to measure: Measure from the tip of one shoulder to the tip of the other, across the back. The shoulder tip is the bony point at the very edge of the shoulder — not the top of the arm. Keep the tape horizontal across the upper back. Note the measurement.
What it affects: A shoulder that is too wide will cause the shoulder seam to drop below the shoulder tip, creating a drooping, shapeless silhouette. A shoulder that is too narrow will pull the shirt across the back and restrict arm movement. The shoulder seam should sit precisely at the shoulder tip — not inside it, not hanging over it.
Measurement 6: Back Length
The back length determines whether the shirt stays tucked correctly throughout the day and whether the hem sits at the correct position when worn untucked.
How to measure: Measure from the centre back of the neck — the same starting point as the sleeve measurement — straight down the spine to the point where you want the shirt to end. For a shirt worn tucked, this should be approximately 30–35cm below the waistband of your trousers. For a shirt worn untucked, it should sit at approximately mid-hip.
What it affects: A shirt that is too short in the back will come untucked throughout the day. A shirt that is too long will create excess fabric that bunches at the waist when tucked.
Your Measurement Reference Table
Once you have taken all six measurements, record them in a simple table that you can refer to whenever you are buying shirts online. The measurements you need are:
- Collar: Neck circumference + 1–1.5cm
- Chest: Chest circumference + 10–12cm (slim fit) or +14–16cm (regular fit)
- Waist: Waist circumference + 10–12cm (slim fit) or +14–16cm (regular fit)
- Sleeve: Centre back to wrist (arm slightly bent)
- Shoulder: Shoulder tip to shoulder tip across the back
- Back length: Centre back neck to desired hem point
Once your measurements are confirmed, the Cotton Satin Slim Fit Blue Men's Shirt is an excellent second shirt to add to the wardrobe. The satin weave adds a subtle sheen that elevates it above a standard cotton shirt; the blue tone is the most universally flattering shirt colour; and the slim fit construction rewards correct measurements with a clean, defined silhouette that a looser fit cannot achieve.
How to Check the Fit Once the Shirt Arrives
When a new shirt arrives, run through this five-point check before removing the tags.
- Collar: Button the collar. You should be able to slide one finger between the collar and your neck. If you cannot, the collar is too tight. If you can fit two fingers comfortably, it is too loose.
- Shoulder: The shoulder seam should sit exactly at the tip of your shoulder. Check in a mirror from the front and back.
- Chest: Button the shirt and raise both arms to shoulder height. The shirt should move with you without pulling at the buttons. If the buttons strain, the chest is too small.
- Sleeve: With the shirt buttoned and your arms at your sides, the cuff should sit at the wrist bone. When wearing a jacket, approximately 1.5–2cm of cuff should be visible below the jacket sleeve.
- Back length: Tuck the shirt in and sit down. The shirt should remain tucked without pulling out at the back.
The Houndstooth Pattern Slim Fit White Men's Shirt is a strong third shirt for the wardrobe once your measurements are confirmed. The tonal houndstooth pattern adds visual interest; the slim fit rewards correct measurements; and the white base keeps it clean and versatile across every suit and blazer combination.
The Investment in Measurement
Taking your measurements correctly takes five minutes. The return on those five minutes is a wardrobe of shirts that fit correctly, look better, and last longer — because a shirt that fits correctly is worn more often, cared for more carefully, and replaced less frequently than one that fits adequately. It is one of the highest-return investments available in men's dressing, and it costs nothing but time.
Explore the full range of men's shirts at Wessi and use your measurements to find the pieces that fit correctly from the first wear.
