A double breasted suit is a suit that has two parallel rows of buttons and a wider overlap than a single breasted suit. It usually comes with four to six buttons while a single breasted suit has two button fastenings.
You can style up a regular double breasted suit with a plain fronted white dress shirt and a classic tie or bow tie. Or go with a slim black tie for an effortlessly elegant look.
A double breasted suit is usually worn at formal occasions like weddings and Christmas parties. This style is considered to be more formal than a single breasted suit.