The area around Rittenhouse Square, particularly Walnut Street between 15th and 20th streets, is a prime destination for serious retail therapy. The posh neighborhood has a long history of elegance, as it has been the seat of Philadelphia’s high society for more than two centuries, and was once filled with refined Victorian-era mansions. Today, such luxury brands as Burberry, Juicy Couture and Tiffany & Co. are found along Walnut Street, with a handful of locally owned high-end shops holding their own among the retail powerhouses. Runway worshippers will find plenty to love at the formidable Joan Shepp boutique, which got its start in the 1970s in the suburbs and has held court in Center City since 1999. Mother-daughter duo Joan and Ellen Shepp deal in sophisticated designs by Dries Van Noten, Balenciaga, Junya Watanabe, and Yves Saint Laurent.