How do you know it's fall? Pippa has new jeans! The younger Middleton sister is a Denim Debutante. Last fall, she paraded an array of blues, from Goldsign and J Brand, as well as colored denim—the hottest trend of the year—by brands like French Connection and SuperDry (that's the epic pink pair you see above!). And her bold bottoms are back this season, as she made her morning coffee run—is that a pumpkin spiced latte in your hands, Pips, because then it really is fall!—in London wearing sea green pants, shown far left, cinched with a navy belt and paired a navy tee and a two-tone sweater. (UPDATE: The jeans are MET's “JEL” jeans in forest green; shop at metonweb.com.) Thanks for ushering in the season, Pippa! Excuse us while we refer to InStyle's Ultimate Jeans Guide, because we need to go shopping.