If I could only buy one thing to update my fall wardrobe, it would be a pair of red boots. Since they appeared on almost every major designer runway, these hot-hued boots are poised to take over city streets. I love how they add a jolt to pretty much any outfit, compliment both jeans and fancy dresses and step through day and night. My favorite ones are by Balenciaga (above), Topshop, Isabel Marant, Zara, Stuart Weitzman, and Gianvito Rossi.