Though based on the Upper East Side, Mary Ping has a growing fan base downtownand an aesthetic that toggles between private school preppy and girl with boyfriend in the band. For the latter, the designer's provocative, draped-front, T-back jersey dress will surely keep groupies at bay. On the whole, however, Ping was feeling more bookish than bad girl for spring, and her shirtdresses, especially one in pale blue, were timely. Paired with a linen denim anorak, shorts in ivory wide-wale cord looked at once smart and sardonic. A waxed trench was a compelling take on a wardrobe staple, and Ping's crinkle crepe satin jumpsuit, as elegantly flou as it was edgy, provided a welcome alternative to an after-eight gown.