The 1980s cult-classic “The Preppy Handbook” was the guide for the seersucker-wearing, Nantucket-vacationing, and boarding school-attending country club class. Author Lisa Birnbach not only officially defined a fashion genre, but she also put into terms exactly how to live a “preppy” lifestyle. The book satirically outlined the acceptable boarding schools, vacation spots, debutante balls, clothing brands, societal clubs, sporting activities and etiquette essential for being the ultimate prep.

Thirty years later Birnbach introduces the sequel to the now out-of-date handbook, “True Prep: It’s a Whole New World.” The new manual tackles everything modern day “preppies” need to know, from the best spa-like rehab facilities, to how to acquire the right attorney to clean your not-so-spotless record, and what brands are considered proper prep attire, such as Tory Burch and JCrew.

Pop your collar and tie a pastel sweater around your neck, because Birnbach will be signing copies of “True Prep” tonight at Sperry Top-Sider in NorthPark Center from 6 to 7:30 pm.

Prizes will be awarded for best-dressed prep, and shoppers have the opportunity to design own-of-a-kind Sperry’s. Monogrammed madras Sperrys?  Now that’s a true prep.