The main difference between a pleated suit and a plain front suit is the type of pleats used on the pants. A pleated suit has pants with pleats, which are folds of fabric that are stitched in place to add fullness and ease of movement to the garment. Pleated suits are typically considered more formal and traditional, and are often worn to special occasions such as weddings and black tie events. In contrast, a plain front suit has pants without pleats. These pants are straight and unadorned, and are often considered more modern and contemporary. Plain front suits are often worn in more casual settings, such as everyday work environments, and are considered more versatile than pleated suits.