Last week a man in his forties came into the department, picked up a size 16 dress shirt, and told me his neck had always been a 15 1/2. He'd been buying shirts too big for twenty years because his dad taught him to wear them that way. In thirty years on the men's floor, I've seen the same mistake over and over. That's why I'm going to show you how to determine neck size the right way — in under two minutes, with nothing fancier than a cloth tape measure.
Why the Right Collar Size Matters
A collar that's too tight cuts off circulation and makes you look like you're being strangled. A collar that's too loose makes you look like you borrowed your older brother's shirt. The right collar should let you slip two fingers flat between the neck and the fabric — no more, no less. That's not a style rule, it's an anatomy rule. Your neck changes a little with the seasons, your weight, even your posture. That's why the fitting room matters.
How to Measure Your Neck at Home
Before you can buy a dress shirt that fits, you have to figure out how to determine neck size correctly. Here's the method I've used with thousands of customers.
Start by standing up straight. Wrap a cloth tape measure around the base of your neck, just below the Adam's apple. Don't pull it tight — you want it snug but comfortable, like a favorite t-shirt collar after a long day. Look straight ahead, not down at the tape. Read the number where the tape overlaps. That's your raw measurement.
Now here's the part most people skip: add half an inch. If your neck measures 15 1/4 inches, you're a 15 1/2. If it's 15 1/2, you're a 16. The half-inch gives you room to breathe without turning the collar into a tent. Most dress shirts sold today come in half sizes from 14 to 19, so you can almost always find your exact match.
Don't have a tape? Use a shirt that fits. Button the top button, lay the collar flat, and measure from the center of the button to the far edge of the buttonhole. Double it. That'll get you close.
When You're Between Collar Sizes
Some men land right on the half-inch mark; most don't. If your neck measures 15 3/8, you've got two choices: round up to 15 1/2 or down to 15. Always round up. A slightly roomier collar can be taken in by a tailor for five to eight bucks, but a collar that's too small can't be let out without ruining the shirt. It's also worth remembering that your neck naturally grows about a quarter-inch from morning to evening, so if you're the kind of man who tries on clothes after work, add a little grace.
Common Mistakes Men Make with Collar Sizing
If you're tired of guessing, take the time to learn how to determine neck size once and for all.
One mistake I see every fall is men buying shirts based on their suit jacket size. The chest and shoulders of a suit jacket don't tell you anything about your neck. Your neck can be a 16 while your jacket is a 42 long. Another mistake is relying on the size stamped on a shirt you've owned for years. That shirt may have shrunk, stretched, or been mislabeled at the factory. I can't count the times a customer swore he'd always worn a 16, only to measure at a 15 1/2 and buy the right size on the spot.
Also avoid measuring yourself while looking in a mirror. Tilting your head down adds an inch. Keep your head straight and look across the room.
How to Test a Shirt in the Fitting Room
Once you've got your number, don't take it as gospel. Put on the shirt and button the top button. You should be able to slip two fingers flat between your neck and the collar without feeling like you're choking. Turn your head from side to side. The collar should move with you, not pinch. The seam where the collar attaches to the shirt should sit right at that little crease where your neck meets your jawline.
If you're between sizes and the store doesn't carry your half size, it's usually worth ordering online. Brands like Van Heusen and Geoffrey Beene offer a full range in most department stores, and if you stick with one brand, their size charts are printed on the back of the package or in their online listing. Don't be surprised if a size 16 in one brand fits differently than a size 16 in another — that's just how clothing manufacturing works.
The Two-Minute Method, Simplified
Here's the whole routine in five steps. Stand up straight, wrap the tape around the base of your neck, add half an inch, round up if you're between sizes, and try the shirt on before you buy it. That's all there is to knowing your collar size for the rest of your life. Write it down somewhere you won't lose it — the notes app on your phone works fine.
Knowing how to determine neck size isn't about being an expert tailor. It's about avoiding the annoyance of a shirt that makes you want to loosen your tie by ten in the morning. Once you have the number, shopping gets easier, returns get rarer, and you stop guessing every time you walk past a rack of dress shirts.
So grab a tape measure, spend two minutes, and then go pick out a shirt that actually fits. If you're shopping at a department store, the fitting room is there for a reason. Try it on. That's what the fitting room is for.
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