How Should a Suit Fit? The Complete Checklist

The one rule that decides everything

Buy for the shoulders. The seam should sit precisely where your shoulder ends — no divot, no overhang, no bunching when you move. Shoulder surgery is the most expensive, least reliable alteration in tailoring; most tailors will simply refuse. If the shoulder fits, almost everything else is a $15–40 fix. If it doesn’t, walk away at any price.

The 8-point checklist, in order of importance

1. Shoulders. Seam at the bone. Non-negotiable, unalterable in practice.
2. Chest and button. Fasten the top button (of two): the lapels should lie flat with room for a fist inside. An X-pull at the button means too tight — a size up plus waist suppression fits better than a size that “closes.”
3. Jacket length. Covers the seat; your curled fingers should just graze the hem. Too short reads trendy-for-2016; too long reads borrowed.
4. Sleeve length. End at the wrist bone, showing about a quarter to half inch of shirt cuff. The single most common visible error — and a $15 fix.
5. Collar. The jacket collar hugs the shirt collar with no gap and no roll. A gap means the jacket’s balance is wrong for your posture — hard to fix, weigh carefully.
6. Trouser waist. Sits at the waist without a belt doing structural work. Two fingers of room.
7. Trouser break. One soft break or none. Pooling fabric at the ankle undoes everything above it.
8. Seat and thigh. Smooth, no horizontal pulling, no diaper of loose fabric.

What a tailor can and cannot fix

Cheap and reliable: sleeve length, trouser hem and taper, waist in or out (about an inch either way), jacket waist suppression.

Expensive or risky: jacket length (moves pocket proportions), shoulder width, major chest work, trouser seat reconstruction.

The buying rule that follows: fit the biggest unalterable part of you — shoulders and chest — and pay the tailor to handle the rest. Budget $40–80 of alterations into every suit purchase; it converts a decent suit into one that looks made for you.