Vera Wang   New York Magazine Pick   The Collection: Flowing fabrics and slim cuts for a fresh yet romantic look. Clean, modern silhouettes are made feminine with ruffled trains, scalloped hems, and beaded bodices.   The Gown: Mock-neck halter with button detail and ruffle train.   The Price: $2,290.   Where to Buy: Gowns range from $2,290 to $25,000 and can be purchased at Vera Wang and Wedding Salon of Manhasset.