Measuring yourself for a suit sounds simple: a tape, a mirror, ten minutes. In practice, most home measurements are off by enough to matter. The tape slips down at the back, the chest is measured with a held breath, the sleeve is taken from the wrong point on the shoulder. A few centimetres in the wrong place is the difference between a jacket that sits cleanly and one that pulls every time you move.
This guide explains how to take each measurement properly, what the numbers are used for, and, just as importantly, what a tape measure cannot tell a tailor. It works for buying a suit online, choosing a ready-made size, or preparing for a remote consultation before a bespoke commission.
How to Measure for a Suit: The Short Answer
Use a soft tape, stand relaxed in a fitted shirt, and ask someone to help with the back measurements. Take these nine:
- Chest: around the fullest part, under the arms, tape level.
- Stomach: around the fullest part, at the navel.
- Seat: around the fullest part of the hips, feet together.
- Shoulder width: shoulder point to shoulder point, across the back.
- Sleeve: shoulder point to wrist bone, arm relaxed.
- Neck: base of the neck, with one finger of room.
- Jacket length: base of the collar at the back down to where the hem should fall.
- Trouser waist: where you actually wear your trousers.
- Inseam: crotch to hem, taken on a pair of trousers that fit well.
The sections below explain each one in detail, the errors to avoid, and what a tape measure cannot tell a tailor.
Body Measurements vs Garment Measurements
There are two kinds of measurement, and mixing them up is the most common mistake.
- Body measurements are taken around and along your body. They are what this guide covers, and what a tailor uses to draft a pattern.
- Garment measurements are taken from a finished jacket or trouser laid flat. They include ease, the extra room that lets you move, sit and breathe.
Never add ease to your body measurements yourself. A tailor adds it according to the cut, the cloth and how you like a garment to feel. If you add a few centimetres “to be safe”, the ease gets added twice and the finished garment looks oversized. The one exception is length measurements such as inseam or jacket length, which are best taken from a garment that already fits you well.
Before You Start
- Use a soft tailor’s tape. A metal builder’s tape cannot follow the curve of the chest or seat, so the readings are unreliable.
- Wear a thin, close-fitting shirt and your usual trousers, and empty your pockets.
- Ask someone to help. You can measure your own chest and waist, but shoulder width and sleeve length need a second person; measured alone, they can easily be out by an inch.
- Stand naturally. Do not pull your stomach in, puff out your chest or straighten up more than usual. The garment has to fit the way you actually stand.
- Keep the tape snug, not tight. You should be able to slide one finger under it.
- Measure twice, write every number down with its unit, and take them at the same time of day.
Jacket Measurements
1. Chest
Raise your arms slightly, place the tape under the armpits around the fullest part of the chest and across the shoulder blades, then lower your arms. Keep the tape level all the way round; it tends to drop at the back. Breathe normally and read the tape at a relaxed exhale.
2. Stomach
Measure around the fullest part of the stomach, usually at or just above the navel. This is different from the trouser waist and tells the tailor how much room the jacket needs where it buttons.
3. Seat
Stand with feet together and measure around the fullest part of the seat. The jacket skirt needs to clear it, which is why this number matters for jackets as well as trousers.
4. Shoulder width
Your helper finds the bony point at the outer edge of each shoulder, where the shoulder turns down into the arm, and measures across the back from one point to the other, following the natural curve rather than pulling the tape straight. This is the single most important jacket measurement, because shoulders are the hardest part of a jacket to alter.
5. Sleeve length
With your arm relaxed at your side and slightly bent, measure from the shoulder point down to the wrist bone. A jacket sleeve generally ends around the wrist bone so that a little shirt cuff shows. If a form asks for sleeve length from the centre back of the neck, measure over the shoulder point to the wrist instead, and note which method you used.
6. Bicep and wrist
Measure around the fullest part of the upper arm with the arm relaxed, and around the wrist just above the wrist bone. Athletic arms are a frequent reason ready-made sleeves feel tight.
7. Neck
Measure around the base of the neck where a shirt collar sits, with one finger under the tape. It is essential for shirts, and for closed-neck garments such as bandhgalas and sherwanis, where the collar sits against the neck.
8. Jacket length
From the base of the collar at the back of the neck, measure down to where you want the jacket to end. A classic suit jacket covers the seat; a useful check is that the hem falls roughly where your fingers curl with your arms at your sides. For a kurta, achkan or sherwani, measure from the same point to the length you want.
Trouser Measurements
9. Trouser waist
Measure where you actually wear your trousers, which for most men is lower than the natural waist. If you prefer a higher rise, measure at that height and say so.
10. Thigh and knee
Measure around the fullest part of the thigh, a couple of centimetres below the crotch, and around the knee. These control how the trouser hangs and whether it pulls when you sit.
11. Inseam and outseam
The inseam runs from the crotch to the hem. It is most reliable taken from a pair of trousers that fits well, laid flat and measured along the inside seam. The outseam runs from the top of the waistband down the side of the leg to where you want the hem, usually measured while wearing the shoes you will wear with the suit.
12. Hem opening and rise
Measure the width of the trouser bottom on a pair whose taper you like. For rise, measure from the crotch seam to the top of the waistband at the front of the same trousers. Our trouser fit guide explains how rise, break and taper change the look.
Quick Reference
| Measurement | Where | Helper needed? |
|---|---|---|
| Chest | Fullest part, under the arms, tape level | Helpful |
| Stomach | Fullest part, around the navel | No |
| Seat | Fullest part, feet together | Helpful |
| Shoulder width | Shoulder point to shoulder point, across the back | Yes |
| Sleeve | Shoulder point to wrist bone, arm relaxed | Yes |
| Neck | Base of the neck, one finger of room | No |
| Jacket length | Base of collar at back to hem | Yes |
| Trouser waist | Where trousers are worn | No |
| Inseam | Crotch to hem, on a good pair of trousers | No |
Measurements for Indian Garments
Wedding wear adds a few numbers a Western suit does not need:
- Kurta, achkan and sherwani length: from the back neck to the hem; a sherwani usually ends between mid-thigh and just below the knee.
- Churidar: calf and ankle circumference, and a longer inseam, since the fabric gathers above the ankle.
- Collar height: how tall a mandarin or bandhgala collar can be before it feels restrictive.
- Head circumference: for a safa, measured around the forehead and the back of the head.
If you are unsure how these garments differ, our guide to the wedding sherwani and the Jodhpuri suit explains the cuts.
