How To · Fashion · Build
How to Fit a Dress Shirt Properly
A dress shirt that fits well transforms your entire appearance—but most men wear the wrong size. Here's exactly how to measure and adjust for a tailored look.
5 min read · IrisMost men buy dress shirts by grabbing their usual size off the rack. The result: collars that gap, sleeves that swallow your wrists, and torsos that billow or bind. A proper fit requires three measurements and an honest mirror—nothing more.
The good news: once you know your numbers, you can shop with confidence and understand what a tailor actually needs to fix. This isn't about trend or preference. It's about proportion.
The shoulder seam should sit exactly where your shoulder ends, not an inch before or after.
What you'll need.
- 01Soft measuring tape
- 02Mirror (full-length or side-view)
- 03Phone camera for reference photos
- 04Tailor contact information
Step one · 2 minutes
Measure your neck
Wrap a soft measuring tape around the base of your neck where a collar sits—snug but not tight. Write down the number in inches or centimeters. This is your collar size. Most men are a half-size off; if you measure 15.5, buy a 16-inch collar, not a 15. You need a finger's width of breathing room when buttoned.
Measure at the end of the day when your neck is slightly swollen from sitting. This gives you a realistic number.
Step two · 2 minutes
Check sleeve length
Wear the shirt and button it. Let your arms hang naturally at your sides. The cuff should hit the base of your thumb—or sit about half an inch above your wristbone. If it's longer, the shirt is too big in the arms. If it's shorter, you need a longer sleeve. Sleeve length is measured from the center back neck seam to the cuff edge.
Have someone else measure while you stand relaxed. Reaching or tensing your shoulders will throw off the measurement.
Step three · 2 minutes
Assess shoulder seams
The shoulder seam—where the sleeve attaches to the body—should sit exactly at the point where your shoulder ends. Not an inch forward, not an inch back. Stand in profile in front of a mirror. If the seam rolls forward onto your arm, the shirt is too large. If it sits behind your shoulder, it's too small. This is the hardest measurement to fix with tailoring, so get it right at purchase.
Take a photo of yourself from the side in good light. You'll see the seam placement more clearly than in real-time.
Step four · 2 minutes
Evaluate torso fit
Button the shirt fully and stand straight. You should be able to pinch about one inch of fabric on either side of your torso—not a handful, not nothing. If you can grab two inches, it's too loose. If the fabric pulls across your chest or stomach, it's too tight. The shirt should skim your body without clinging or billowing. Excess fabric at the sides is the most common fit problem.
Sit down while buttoned. If the shirt pulls or gaps at the buttons, the torso is too tight. You'll need a bigger size or tailoring to add side seams.
Step five · 1 minute
Check the button stance
When fully buttoned, no buttons should pull or strain. The placket (the front panel where buttons sit) should lie flat without tension. If buttons are pulling, the shirt is too tight in the chest—don't force it. A tailor can add fabric to the sides, but a too-tight chest usually means you need the next size up.
Most dress shirts can be taken in at the sides by a tailor, but letting them out is limited. Buy slightly loose if you're between sizes.
Step six · 1 minute
Plan your tailor adjustments
Write down what needs fixing: sleeve length, side seams, torso length (hem), or collar adjustments. A good tailor can handle sleeves, sides, and length easily. Shoulder seams and collar width are harder—if those are wrong, exchange the shirt instead. Budget $15–30 per shirt for standard alterations. This investment makes the difference between looking sharp and looking sloppy.
Bring the shirt to a tailor before wearing it. Alterations are easier on unworn fabric, and you'll catch fit issues early.
How to know it works.
A well-fitted dress shirt should feel invisible—no pulling, no excess fabric, no distraction. You should be able to move freely, button and unbutton without tension, and look proportional from all angles. The collar should sit flush against your neck, the sleeves should end at your wrist, and the torso should skim without clinging.
Questions at the mirror.
The collar gaps at my neck. What's wrong?
You're wearing a collar that's too large. Go down a half-size. A gap means air between fabric and skin, which looks sloppy and defeats the purpose of a dress shirt. If you're between sizes, a tailor can take in the collar, but it's cheaper to buy the right size.
My sleeves are too long. Can a tailor fix this?
Yes, easily. A tailor will hem the cuff or, on some shirts, move the cuff up and re-attach it. This costs $10–15 per shirt. Sleeves are one of the most common alterations.
The shirt fits my neck and shoulders but the torso is too big. What do I do?
A tailor can take in the side seams, removing excess fabric from both sides. This is standard work and costs $15–25. Avoid buying a smaller size overall, which will make the neck and shoulders too tight.
Should I size up if I'm between sizes?
Only if the shoulder seams are correct. If the shoulders fit, you can tailor a slightly loose torso. If the shoulders are wrong, no tailor can fix it—exchange the shirt for the right size.
How tight should the collar actually be?
Tight enough that you can't pull the fabric away from your neck, but loose enough to slip one finger between the collar and your skin when buttoned. This is the standard for a professional fit.