Vest Closure and Button Fit Guide

Button fit

Buttons are the most honest test of a vest fit, because they show pulling at once. When a button vest fits, the front lies flat between the buttons and the buttons sit in a straight line down the centre. When it is too small, the fabric between the buttons stretches into horizontal lines, the buttons look strained, and the front panels pull sideways. That pulling will not settle with wear, and it will look worse as the shirt beneath shifts during the day.

Check each button, not just the top one. The middle buttons take the most strain across the chest, while the bottom button takes the strain when you sit. Fasten every button, sit down, and look at the bottom button in a mirror. If it pulls or drags the hem upward, the vest is too small at the chest or too short at the back. If the buttons fasten easily but the front gaps open between them, the vest may be too large, or the button spacing may not suit your shape.

The bottom button rule

On a suit vest, the bottom button is traditionally left undone, which gives the vest room to move when you sit and keeps the hem from pulling. That rule applies to a suit vest worn with a jacket, and it is a style choice rather than a fit fault. On a casual vest or a puffer vest, the bottom button is usually fastened for warmth, so check that it fastens without pulling when you sit.

Do not use the bottom button rule to hide a vest that is too small. If the vest only fits when the bottom button is left undone, and it pulls when you fasten it, the chest is too small for the cut. A well fitting suit vest should still fasten at the bottom without strain, even if you choose to leave it undone as a style choice.

Zip fit

A zip vest should close in one smooth motion from the bottom to the top, with the zip line running straight down the centre. If the zip bows outward, catches on the fabric, or resists closing at the chest, the vest is too small. If the zip line waves from side to side when the vest is closed, the vest may be too large, or the zip may be set into a front that is cut too full for your shape.

Check the zip at the neck and the hem as well. At the neck, the zip should sit flat without digging into the throat when closed to the top. At the hem, the zip should end level with the hem, not above it, so the front closes fully. A two way zip, which opens from the bottom as well as the top, gives extra room when you sit, and it is worth checking that the lower slider moves freely before you buy.

Open fronts and other closures

An open vest has no buttons or zip, so it is the most forgiving closure at the chest. The front edges should hang straight from the shoulders to the hem, without swinging outward or curling inward. If the front edges swing away from the body when you walk, the vest is too large or the front is cut too full. If they pull toward the centre, the vest is too small across the chest even though nothing has to fasten.

Some vests use snaps, hooks or a drawstring hem instead of buttons or a zip. Snaps should close without a gap between the front panels, hooks should hold without strain, and a drawstring hem should let you adjust the fit without bunching the fabric. Whatever the closure, the test is the same: fasten it, sit down, raise your arms, and check that the front stays flat and the hem stays level.

Closure checks

• Buttons fasten with the front flat and no horizontal pull lines.
• Bottom button fastens without dragging the hem when you sit.
• Zip closes smoothly with a straight line and no bowing.
• Zip sits flat at the neck and ends level with the hem.
• Open front edges hang straight without swinging or curling.
• Snaps and hooks hold without a gap between the front panels.