Shirt Fit: The Four Points That Decide Everything

Shirt sizing is close to meaningless across brands. A medium is a different garment depending on who made it, and slim, regular and relaxed describe a philosophy rather than a measurement. What is consistent is the set of physical checks below — four points that determine whether a shirt looks right on a body, in the order of how much they matter and how hard they are to fix.

1. The shoulder seam — the one that cannot be altered

The seam joining the sleeve to the body should sit at the edge of your shoulder, where the flat top of the shoulder starts to curve down into the arm. That is it. That is the whole test, and it is the most important one because a tailor cannot meaningfully move it.

If the seam sits inside that point, the shirt is too small: you will feel it pull across the back when you reach forward, and creases will radiate from the armhole. If it hangs down your upper arm, the shirt is too big, and the sleeve will look collapsed and shapeless no matter how well the rest fits.

Practical consequence: buy for your shoulders, then have the body taken in if it is loose. A tailor can narrow a body cheaply and can shorten sleeves easily. Nobody can add shoulder width you did not buy.

2. The collar

With the top button fastened, you should be able to slide two fingers comfortably between the collar and your neck. One finger and it is too tight — you will feel it every time you turn your head, and it will feel worse as the day goes on. Three or more and the collar gapes, which makes the whole shirt look borrowed.

Note that collars shrink slightly with washing, so a collar that is exactly right when new is likely to be tight in a few months. Fit it with a little room.

Collar shape

• Point collar — narrow spread, the standard. Lengthens the face; good with a tie or without.
• Spread / cutaway — wider angle. Balances a narrower face and fills the space under an open jacket.
• Button-down — casual by origin, holds its shape without stiffeners, and the most forgiving collar to wear open.
• Band / mandarin — no fold-over. Clean and modern, and it removes the whole gaping problem.

3. The sleeve

A long sleeve should end where your wrist meets your hand — at the bone, so the cuff just touches the base of your thumb when your arms hang naturally. Longer than that and it swallows your hands; shorter and it rides up your forearm every time you bend your elbow.

The cuff should be snug enough that it cannot slip over your hand without unbuttoning, but loose enough for two fingers underneath. Sleeve width matters too: a sleeve should follow the arm with a little room, not balloon. If you can pinch several centimetres of spare fabric at the bicep, the shirt is cut too generously for you.

Short sleeves should end around mid-bicep, and no lower than just above the elbow.

4. Length

How long a shirt should be depends entirely on how you intend to wear it, and this is the check people most often skip.

• To be tucked in: long enough to stay tucked when you raise your arms — roughly 8–10 cm below the waistband, usually with a curved hem.
• To be worn untucked: the hem should fall somewhere between the top and middle of your back pocket, and ideally the front hem is straight or only gently curved.
• A long, deeply curved dress-shirt hem worn untucked always looks like a mistake, because it is one — that shape exists to stay tucked.

The body

With the shirt buttoned and standing normally, the placket should lie flat with no horizontal pulling and no X-shaped creases radiating from the buttons. Any of those means it is too tight across the chest — and unlike shoulders, this is not something to size up for automatically, because sizing up brings the shoulder seam down your arm. Try a different cut instead.

At the waist, you should be able to pinch a few centimetres of fabric on each side. Much more than that and the shirt billows when tucked; much less and it clings.

Sitting down and reaching up

Most shirts are tried on standing still in front of a mirror, which is not how they are worn. Before deciding, sit down, cross your arms, and reach forward as if for a steering wheel. If the back pulls hard, the buttons strain, or the shirt untucks itself, it will do all of that on a normal day too.

What to fix and what to walk away from

Fixable cheaply: sleeve length, body width at the waist and sides, hem length. Not fixable: shoulder width, collar size, and a body that is genuinely too tight across the chest.

So the buying rule follows directly. Fit the shoulders and the collar in the shop, tolerate a body that is slightly loose, and budget a small amount for alterations. A ₹1,500 shirt altered to fit properly looks better than a ₹5,000 shirt that does not.