"This party is so 'Buffy.' I don't mean like the T.V. show Buffy, I mean like these people might all be named Buffy. I'm surprised they didn't bring their tennis rackets," a rumpled cigarette-smoker was saying just outside the party for the second book in "The Upper Class" young adult series at Tailor last night. Well, sure: The party partly was a reunion of sorts for kids who went to Hotchkiss, the posh Connecticut boarding school the books' three authors attended. But party cohost and Heatherette designer Richie Rich had also brought with him a strong contingent of people who work in fashion or at the very least have been on a reality show about working in fashion. And holding court in a corner was the party's other cohost: The most popular boarding school girl of all time, Tinsley Mortimer. The exhilarating ripple of her voice was like a wild tonic in the rain. But Tinsley herself was less like a tonic and more like one of the bubblegum vodka martinis ("bazookas") being dispensed by the open bar: Totally sweet and not at all horrible like maybe you'd expect! Nikola Tamindzic captured the moments.