How to Choose a Suit | Fit First, Then Everything Else

A suit fits correctly when the jacket shoulders sit flush and the buttoned chest allows a flat hand to slide inside.

Most men choose a suit by color or price first, which is backwards. How to choose a suit starts with fit, and fit alone decides whether you look sharp or sloppy. Shoulders, chest, sleeve length, trouser waist, and inseam matter more than fabric or pattern. The good news: most off-the-rack suits can be tailored into a proper fit — you just need to know what to check before buying.

What Fit Details Matter Most?

Fit determines everything, so start there. Shoulders are the hardest part to alter, so check them first: the seam should sit flush with your own shoulder, and pads should never extend past your shoulder line. If they do, the jacket is too big — no tailor can easily fix that.

Next, button the jacket and slide a flat hand into the top of the chest. It should enter comfortably but not loosely. Too much room means oversized; too tight, and you’ll struggle to move. On a two-button suit, the top button should sit at or above your navel, and the bottom button should always stay undone.

Jacket length matters too: with arms hanging, the jacket should cover your seat and end roughly in line with your knuckles. Sleeves should show about half an inch of shirt cuff.

How Should Suit Trousers Fit?

Trouser fit matters more than most realize, since you can’t hide a bad waist with layering. The waist should sit comfortably without a belt, and you should sit without strain. If trousers are tight when sitting, buy up, then take the waist in. Inseam length is preference, but a slight break at the shoe is safest. Trouser alterations are straightforward, so don’t pass on a great jacket because the pants need hemming.

How Do You Measure Yourself For A Suit?

For online shopping, Macy’s instructs measuring shoulders, chest, waist, and inseam with a tape measure — chest around the fullest part, waist at the natural crease, in undergarments or light clothing. For sleeve length, measure from the center back of your neck, across the shoulder, down to the wrist. Between sizes? Order larger and plan tailoring — it’s easier to take in than let out.

Fabric, Color, And Occasion — What Comes After Fit?

Once fit is locked, choose fabric by climate and use. Midweight fabrics (10–12 oz) work year-round; lightweight wool blends suit warmer weather, and full wool gives a smoother drape. Very high thread counts reduce durability, so don’t chase the biggest number.

For a first suit, navy or charcoal are versatile picks — both work for interviews, weddings, and business meetings. Lapel style follows occasion: notch for everyday, peak for more impact, shawl for formal events. Choose solid for versatility, or subtle windowpane for personality.

Before buying, try on top choices in person. Check fabric drape in real light and move your arms to confirm the chest isn’t restrictive. When ready, our best business suits roundup covers tested options across price ranges.

What Are The Most Common Suit Mistakes?

The biggest mistake is buying for style before checking fit. Shoulder overhang or an oversized chest always looks wrong, regardless of fabric. Buttoning the bottom button of a two-button jacket is another classic error, and ignoring trouser fit is a third.

Don’t assume tailoring fixes everything. A tailor can adjust sleeves, take in a waist, or hem trousers, but shoulder corrections are expensive and often unsatisfying — if the shoulders don’t fit, walk away. For most men, ready-to-wear with basic alterations delivers excellent value. Made-to-measure only becomes necessary when your jacket and trouser sizes don’t match standard drops.