How to Check Blazer Fit in 60 Seconds in Front of a Mirror

You are in a shop, or standing in front of your own wardrobe, and you have about a minute. This is the order to check things in, and — just as importantly — the order to stop in.

The sequence matters because some failures make everything downstream irrelevant. There is no point measuring a sleeve on a jacket whose shoulder is wrong.

The sequence

The 60-second fit check

Wear the shirt and shoes you would actually pair with the jacket. Fasten the top button before you start.

1. 1. Shoulder seam Directly above the point where your shoulder bone ends. Failure here is fatal — stop.
2. 2. Collar Flat against your shirt collar at the back. A gap is fixable but costs money.
3. 3. Chest Flat hand slides in; no X-shaped creases at the button. Failure here is fatal — stop.
4. 4. Sleeve Ends at the wrist bone with about a centimetre of shirt showing. Easily fixed.
5. 5. Hem Covers your seat, lands around your cupped fingers. Fixable within limits.
6. 6. Movement Sit, reach forward, raise both arms. The jacket should follow you, not resist.

Fatal vs fixable

This is the distinction that turns a fit check into a buying decision.

Criterion	Verdict	What to do
Shoulder wrong	Fatal	Put it back. No amount of money fixes this well.
Chest too small	Fatal	Put it back. The canvas is cut to size.
Lapel too wide or narrow for you	Fatal	Set at the pattern stage.
Collar gap	Fixable, skilled	Add the cost of a balance alteration.
Waist too loose	Fixable, routine	Add a small alteration cost.
Sleeves too long	Fixable, routine	Almost always worth it.
Hem slightly long	Fixable, limited	Depends on pocket position.
Jacket lifts when you raise your arms	Fatal in practice	The armhole is cut too low. Nothing can raise it.

Why movement is on the list

Almost every fit failure is invisible while standing still, which is exactly the posture people adopt in front of a shop mirror.

Four movements expose almost everything:

• Sit down. Does the collar climb up the back of your neck? That is a balance problem.
• Reach forward, as if to shake hands. Do the shoulders follow you, or do you feel the jacket resisting across the back?
• Raise both arms to shoulder height. Does the whole jacket lift with them? That is a low armhole, and it is the single most under-noticed comfort problem in ready-made jackets.
• Cross your arms. You should feel the cloth without feeling the seams.

The armhole one deserves emphasis. A high, well-cut armhole lets your arm move independently of the jacket. A low one is cheaper to manufacture and drags the whole garment upward every time you lift an elbow. It cannot be raised afterwards. It is why some expensive jackets feel worse than inexpensive ones.

Checking your own jacket at home

The mirror lies, mostly by being directly in front of you. Two additions make a home check far more accurate.

Photograph yourself from the side. This is where collar gap, jacket length and the way the lapel rolls become obvious. It is also the angle most people never see themselves from.

Photograph yourself seated. Since a large part of the time you wear a jacket you are sitting down, and almost nobody checks it.

Take both at chest height, straight on. A low camera angle exaggerates shoulder width and hides a divot.

Scoring it honestly

If two or more of the six checks fail, it is the wrong jacket — not a jacket that needs work. That threshold sounds arbitrary and it is a reasonable rule of thumb: one problem is an alteration, two are a pattern that does not match your body.

How fit checks go wrong

1. Checking with the jacket unbuttoned

   An open jacket hides every chest and waist problem there is.

   Fix Fasten the top button before check three.

2. Checking over a t-shirt

   Without a shirt cuff there is no reference for sleeve length, and the chest sits differently.

   Fix Wear the shirt you would actually pair with it.

3. Checking with the wrong shoes

   It matters less for the jacket and enormously for the trousers you are checking at the same time.

   Fix Wear the shoes, or bring them.

4. Standing straighter than you normally do

   A held, upright posture flattens the upper back and temporarily removes a collar gap that will return the moment you relax.

   Fix Stand the way you actually stand.

5. Checking only from the front

   Balance, length and lapel roll are side-view problems.

   Fix Take a side photograph. It is the most informative thirty seconds available.

The Radha perspective

At a fitting we ask customers to move rather than stand — sit down, reach for something, put their hands on a table. It occasionally surprises people, who expect to be told to stand still. But a jacket that only works standing still is not a jacket that works.

Next step

Run the six checks on the blazer you already own, and take the two photographs. Whatever you find will fall clearly into fatal or fixable — and if it is fixable, it is a single visit to a tailor away from being solved.