Style Guide: Buttoning Rule For Suits

There are several reasons to care about how and when to button your suit jacket:

• It sends a signal that you pay attention to the details. 

• In most situations, this makes a suit look better on a man. A buttoned suit when standing cuts a cleaner silhouette.

• Prevent the buttons from popping. When seated, unbuttoning allows you to sit more comfortable, prevents wrinkles and keeps the buttons from popping.

• Suits are tailored with the assumption that the bottom button will never be fastened. Modern suits are cut in such a way that the fabric doesn’t drape properly when the bottom button is fastened for a two button or three button jacket.

Buttoning Rules For Single-Breasted Suit Jackets

1. One-Button Suit Jackets

Keeping the button fastened maintains a balanced proportion. These jackets should ALWAYS be buttoned when standing. Unbutton the jacket when sitting down, so that it doesn’t crease.

2. Two-Button Suit Jackets

The traditional way to button a two-button jacket is to always fasten the top button and leave the lower undone.

3. Three-Button Suit Jackets

"Optional, always, never” refers to each of the three buttons. When standing, it is optional to button the top, the middle always, and the bottom never.

Buttoning Rules For Double-Breasted Suit Jackets

Double-breasted jackets are almost always worn buttoned. It’s very unusual to unbutton one. Button all the buttons that have working buttonholes.

If you plan to leave some buttons undone, it is most traditional to fasten the top button. However, men who prefer a longer line have been leaving the lowest button undone, including members of the British royal family, so you’re probably safe either way.