as a tall fit young person (F**k me, right?) i fully endorse pleats. Typically, I think of pleats as an advanced move. For suits, i almost always prefer a single pleat to ff. In genreal I think the key to making them work is 1. making sure the trousers in question are not khaki chinos. 2. No belt 3. getting the break exactly right. too long and you achieve the ultimate in slouchy middle manager, too short and they'd make wilt chamberlain look stubby.