There's a basic rule when it comes to buttoning up a suit jacket: "Sometimes, Always, Never" — if you have a three-buttoned jacket, sometimes button the top one, always button the middle one, and never button the bottom one. In a two-buttoned suit, you should always button the top button and never the second.

Do you button your suit jacket for an interview?

Blue is your best suit color for a job interview. ... Only the top button of the suit coat is buttoned. The bottom button is never buttoned. Unbutton your jacket when you sit down.

Do you button a suit jacket with a waistcoat?

On a business suit, wedding suit or a casual waistcoat, you never fasten the bottom button. ... Traditional rules state you do button all the buttons on a dress waistcoat because it is deemed appropriately formal, but otherwise, leave it loose.