On the first day of October, Paris Fashion Week show-goers embraced the changing season with a range of outerwear — from short jackets to cocoon coats. The one through line, however, was the addition of a belt tied around the waist. Sure, lots of jackets come with belts that are often ignored and left dangling absentmindedly. But these ladies made a case for the sophisticated and flattering effects of a waist-defining cinch, whether it be tied or buckled. For evidence, see above.