How to read a jacket shoulder.

Stand sideways to a mirror and find the seam before you fall for the cloth. If the shoulder is wrong, the lapel, the buttons, and the sleeve are costume. A tailor can often improve a waist or a sleeve length. A shoulder that misses your own bone is a different problem, and it should stop the purchase. The blue windowpane three-piece at the top of this essay is a structured suit, hand at the front, which is where men look first. Look higher. The shoulder is the decision.

A black suit later in the essay shows a harder, padded line. A camel blazer over a tee shows a soft shoulder. Read them as two constructions. The tests apply to both.

Find the shoulder point

Your shoulder point is the little shelf where the shoulder bone ends and the arm begins. In a structured jacket, the seam or the edge of the pad should sit on that shelf. Raise an arm slightly, then let it hang. Have someone look from the side, or use a second mirror. If the seam lands on the upper arm, past the bone, the shoulder is too wide, or the pad extends too far. The sleeve will then collapse into folds just below the seam, and the chest will look larger than you are.

If the seam sits inward of the bone, the jacket is tight for your frame. You may see the collar lift, or a pull from the neck toward the sleeve. Leaving it unbuttoned will not fix a width that was cut into the pattern. Reach as if you were taking a wallet from an inside pocket. The pad should stay on the bone. A jacket that looks right only at attention does not fit the shoulder you live with.

Divots, wrinkles, and a clean sleeve head

A divot is a small hollow or dimple where the sleeve meets the shoulder. One cause is a shoulder that is narrow for you, so the cloth is stretched over the bone and dips beside it. Another is a sleeve pitch that does not match the way your arm hangs. Pitch is the rotation of the sleeve in the armhole. If your arms hang slightly forward, a sleeve set for a parade posture will wrinkle in a spiral and pull the shoulder head.

Horizontal folds across the upper back often mean the jacket is tight across the blades, or short in the balance. Vertical folds under the collar can mean a long collar or a loose upper back. A soft jacket will show more movement than a canvassed suit. The useful question is whether the cloth is flexing or the pattern is fighting you.

A clean sleeve head is smooth where the sleeve joins the shoulder. On a structured jacket that means no puff and no sink. On a soft jacket a little ease is part of the look. Diagonal wrinkles that appear the moment your arms hang still usually mean pitch, width, or both.

What you see	Likely cause	In the shop	At a tailor
Seam past the shoulder bone	Shoulder too wide, or pad too long	Try a smaller shoulder	Narrowing is major work
Divot at the sleeve head	Too narrow, or pitch is off	Try the next size or a different pattern	Rarely a small let-out
Spiral wrinkles on the sleeve	Pitch does not match your arm	Move and compare another jacket	Rotating a sleeve is serious
Collar lifting at the back	Balance, tight shoulders, or posture	Check with your usual shirt	Sometimes a collar adjustment
Clean head, easy reach	Shoulder is close	Stop and check waist and sleeve	Small work may be enough

A black suit on a sidewalk, one hand in a pocket, is a structured shoulder doing its job in ordinary posture. Pocketed hands change the drape. If the shoulder divots only in that pose and lies quiet when the arm hangs, you are seeing posture. If it divots in both, you are seeing the jacket.

Collar and neck

The collar should lie against the shirt collar all the way around the neck. A traditional cue is a narrow band of shirt collar above the jacket, often about half an inch. Taller shirt collars and shorter jacket collars both exist, so treat the band as a hint. The failure is a gap: daylight between jacket and neck, especially at the center back. Balance, tight shoulders, or a collar stand cut long for you will do that. The shirt is not always the cause.

Button the jacket before you judge the collar. An open front hides a collar that rides up the moment the waist is fastened. Turn your head. The collar should not saw, and the lapel should stay on the chest. A gap that appears only when you hunch is posture. A gap while you stand easy is the jacket. Collar work is real, and it is wasted on a shoulder that was never yours.

Structured and soft

A structured suit shoulder uses a pad, and often canvas, to hold a line from neck to sleeve. The blue three-piece and the black suit sit in that family. The line can flatter a sloping shoulder. It looks like armor when the pad is thick or lands halfway down the arm. Feel for the end of the pad at your shoulder point.

A soft shoulder reduces or removes that pad. The camel blazer in the next photograph is the idea: cloth, a light structure, and a shoulder that follows you. The seam should still meet your bone, and the sleeve should hang without a spiral of stress. Soft cloth wrinkles more and hides less. Choose structured when you want a line that stays put under a tie. Choose soft when the jacket lives over a tee or a knit.

Sitting changes the shoulder. The camel blazer, tee, and light jeans are a soft jacket at rest on a stool. Watch the collar at the back of the neck and the top of the sleeve. If those stay quiet while seated, the shoulder is doing more than posing for a standing mirror.

Alterations, in order

Take the problems in the order a tailor cannot reverse. Shoulder width comes first. Ask to see any seam allowance. Many jackets have little or none there. A shoulder that is too narrow usually cannot be let out into a new shoulder point, because the sleeve head was cut where it is. A slightly wide shoulder can sometimes be narrowed, and that rebuilds the sleeve and the collar. If the estimate sounds like a new jacket, choose another jacket.

If the shoulder is right, talk about collar and balance, then the waist, then the sleeves. Sleeves shorten more readily than they lengthen. Waist and button stance are ordinary work when cloth remains in the seams. Rotating a sleeve to fix pitch disturbs the lining. Do that only when the wrinkles are clearly pitch and the jacket is otherwise worth keeping. Settle the shoulder in the shop, with a different size or pattern, before you pay anyone to argue with the cut.

• Find your shoulder point in the mirror before you judge the lapel.
• Reject a seam that lands on the arm or pinches inside the bone.
• Separate a divot caused by pose from a divot that is always there.
• Check the collar with the jacket buttoned and your arms at rest.
• Ask what can be let out, and look at the allowance.
• Spend on a waist or a sleeve only after the shoulder is accepted.

On a retail site, use the size notes beside your own measurements, and read the return terms before you pay for a shoulder you cannot try twice.

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