Suspenders permit the trousers to hang best, supporting the front of the pants as well as the rear. They allow the pleat to establish its proper line and make the crease of the trousers more apparent. Additionally, suspenders are more comfortable than belts, which must be drawn tight around the waist in order to hold up the trousers. With suspenders, trousers can be worn loosely around the body, the only contact one feels coming at the point where the suspenders cross the shoulders. One might also note that during the summer months the wearing of suspenders actually promotes a certain coolness, as the roominess of the trousers around the waist area makes for improved air circulation.
Suspenders also have the added advantage of allowing the length of the trousers to remain constant.
Normally, a man's trousers stretch at the waistband during the course of a day. Suspenders eliminate the need to pull them up two, three, four, or more times a day. For all these reasons and more, suspenders will always remain preferable to belts in dress wear. Frankly, there is a simply no place for belts in the realm of tailored clothing. They cut a man's body in half, interrupting the smooth transition of the suit from shoulders to trouser cuffs.