Two button suits should " should have blank number of buttons, buttoned at a formal?

The 2 button suit is the standard executive suit worn by businessmen all over. This type of suit is the number one choice among Americans for all types of events requiring a suit.

Two button suit jackets should always be worn with the bottom button left undone. This will allow the wearer to sit down without risking a tear of their button.

The 2 button style is usually set lower than the top button of the three button suit, but can be styled more like the 3 button suit at times. This look is a good happy medium for those that want to wear a two button without having to bear so much of their chest.

For a formal suit you should only have one button done up. The top one.

Only the top button should be buttoned. Simple as that.