How to measure a dress shirt properly

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What measurements you actually need

To get a dress shirt that fits, you need a few key measurements: neck (collar), sleeve length, chest and waist. Many UK brands size shirts by neck and sleeve, with the cut (slim, regular, classic) handling chest and waist. If you’re ordering made-to-measure or checking a shirt you already own, add shoulder width, shirt length and cuff.

What you’ll need

• A soft tape measure (tailor’s tape)
• A well-fitting shirt to compare against (optional)
• A mirror or a helper
• A pen and paper (or your phone) to note sizes
• Wear a thin T-shirt or the underwear you’d normally wear under a dress shirt

Prepare for accurate results

Take measurements at the end of the day when your body is at its largest. If someone can help, you’ll get more accurate sleeve and shoulder numbers. Keep your arms at your sides unless the step says otherwise. Note each value immediately so you don’t mix them up.

Measure your body for shirt sizing

1. Neck (collar size)

   Wrap the tape around the base of your neck where a collar sits, just below the Adam’s apple. Keep one finger inside the tape for comfort allowance. Record the measurement (commonly listed in inches for UK collars).

2. Sleeve length

   Stand straight with your arm relaxed, keeping a slight bend at the elbow. Measure from the prominent bone at the base of your neck (centre back) across your shoulder to the top of your arm, then down the outer arm to the point where your wrist meets your hand. Note the total length. Repeat for the other arm and use the longer.

3. Chest

   Measure around the fullest part of your chest, under the arms and across the shoulder blades. Keep the tape level and snug. Breathe in and out normally; you want a value that allows comfortable movement.

4. Waist (natural waistline)

   Find your natural waist (above the hips, below the ribcage). Measure around, keeping the tape level. This helps you pick between slim, regular or classic cuts.

5. Shoulder width

   Measure from the edge of one shoulder (where a shirt’s seam would sit) straight across the back to the other edge. This guides how the yoke and shoulder seams will sit.

6. Cuff circumference

   Measure around your wrist where a cuff sits. If you wear a watch, measure over it as well to check the required ease.

7. Shirt length guide

   Measure from the top of your shoulder near the collar down the front to where you want the shirt to end. For tucking, the hem should be long enough to stay put when you move. If you’re comparing to a size chart, check whether it lists back length and, if so, measure from the highest point of shoulder at the back (next to the collar seam) straight down to your desired hem.

Measure a shirt you already own

If you have a dress shirt that fits well, measuring it flat is a quick way to match another brand’s size chart.

1. Collar

   Lay the shirt flat, collar open. Measure from the button centre to the far end of the buttonhole. This approximates the collar size.

2. Sleeve

   Measure from the shoulder seam to the end of the cuff. For total sleeve length including shoulder, measure from the centre back yoke seam (just below the collar) to the shoulder seam, then add the sleeve seam to the cuff; or measure in one continuous line from the centre back yoke seam to the end of the cuff if that matches the brand’s chart.

3. Chest (pit to pit)

   Button the shirt and lay it flat. Measure straight across from armpit to armpit, then double the number for the full chest.

4. Waist

   Measure across the shirt at its narrowest point between chest and hem (or at the spot the brand specifies, such as a set distance below the armhole), then double the number for the full waist.

5. Shoulders

   Measure straight across the back yoke from one shoulder seam to the other.

6. Shirt length

   Measure from the highest point of the shoulder (next to the collar) down to the hem.

Choosing the right fit and allowances

A dress shirt should sit cleanly without pulling across the chest or gaping at the buttons. The collar should allow a finger’s comfort; the shoulder seam should sit near the shoulder edge; sleeves should show a little cuff when you wear a jacket. Slim, regular and classic fits change chest and waist ease: choose based on your measurements and how you like a shirt to drape. If in doubt between two collar sizes, many prefer the larger for comfort.

Common mistakes to avoid

• Measuring over thick clothing
• Pulling the tape too tight
• Ignoring that sleeves are measured from the centre back on some size charts
• Not checking both arms for sleeve length
• Forgetting watch allowance at the cuff
• Assuming the same labelled size fits across all brands

Next steps

Match your measurements to the brand’s size chart in the units they use. Prioritise collar and sleeve length first, then choose the cut that suits your chest and waist. If the collar and sleeve are perfect but the body is too roomy or snug, consider tailoring the side seams or darts for a cleaner line.

Dress shirt measuring FAQs

Do UK dress shirts use inches or centimetres?

Most UK brands list collar and sleeve in inches. Chest and waist may appear in centimetres on some charts; follow the brand’s units.

How tight should the collar measurement be?

Measure snug with one finger under the tape. This comfort allowance helps the collar sit neatly without pinching.

What if my arms are different lengths?

Measure both and use the longer. Some brands offer different sleeve options, and a tailor can fine-tune cuffs if needed.

Can I measure a shirt instead of my body?

Yes. A well-fitting shirt measured flat is a reliable reference, especially when comparing across brands’ size charts.

How much cuff should show under a jacket?

Typically a small sliver—around the width of a watch strap—so the shirt frames the jacket sleeve cleanly.