As a double-breasted suit is more on the formal side, pair it with a well-fitting dress shirt, ideally white or in a lighter colour for a clean and crisp look. The jacket should always be buttoned when standing, with only the top button of the inner row fastened. Pair the suit with a classic tie or bow tie that works with the colour and style of suit. Finish the outfit with polished dress shoes, a matching pocket square and a belt.