In his first showing at the tents, Derek Lam sent out a quite appealing collection, one based on hoi polloi summer memories — Asbury Park, Coney Island, Key West. The motif made for an upbeat, breezy lineup, filled with snappy star prints, feisty colors and shiny dégradé florals intended to mimic the faded chintz of an old couch left outside for someone to claim. Yet this was no mere beach parade, as Lam turned his summer lovin’ toward such reasonable fare as soft, workaday dresses; skirts and dresses with rounded front panels in substantive double crepe; strong outerwear pieces, and diverse corsetry, including a pair of deep-waisted diva trousers. Less reality-based, though plenty charming, was his pinup moment: a series of swimsuit-romper affairs Lam said were for “deck-side entertaining.”