Men's Double-Breasted (Suits & Blazers)

Two vertical columns of buttons sit on the front and the jacket wraps one panel across the other before fastening. Only some of those buttons do anything: a six-by-two, the common arrangement, shows six and fastens two.

Wrapping the front leaves an inner panel hanging loose, held by a jigger, a hidden button inside the jacket that anchors the underlap. Without it the front twists off center within an hour. Lapels are nearly always peak, angled up toward the shoulder, because the wrap creates a strong horizontal line that a notch lapel cannot balance. All that extra cloth across the chest also makes the jacket warmer than a single-breasted one in the same cloth weight.

The rule that separates this from every single-breasted jacket is simple: you cannot wear it open. A single-breasted suit jacket or blazer looks fine unbuttoned, while this one falls away into two loose flaps. Compared with a three-piece, it covers the shirt front and waistband using one garment instead of adding a waistcoat, which matters a great deal in a warm room.

Taller and leaner frames carry it best, because the wrap and wide lapels add visual breadth that a narrow body can spare. Shorter men and thicker midsections get the reverse, since the horizontal button line cuts the torso in half and the wrap piles cloth at the stomach. Think twice if you sit all day, because standing means buttoning and sitting means unbuttoning, every single time.

Button it in the fitting room, then sit, stand and walk, because only movement reveals whether the wrap stays flat or pulls into a diagonal crease. The underlap should run deep enough that no lining peeks at the hem. Confirm the jigger button is there and that you can reach it one-handed. Hang it buttoned, since the wrap sets its shape on the hanger and an open jacket dries into the wrong line after damp weather.