A single-breasted suit jacket is a classic style of men's formalwear. It features a front closure that overlaps just enough to permit buttoning. The number of buttons typically varies from one to three, but occasionally up to four. It's characterized by a narrower overlap of fabric in the front compared to a double-breasted jacket, and it only has one column of buttons and a narrow strip of fabric overlap. This style gives a clean, streamlined appearance making it versatile for both formal and casual occasions. When standing, traditionally only the top button is fastened. When seated, the jacket should be unbuttoned for comfort. Single-breasted jackets can be paired with different trouser styles, and they are often favoured for their simplicity and timeless appeal.