When the social set is given the opportunity to shop and lunch, shopping comes first. Such was the case Friday when Samantha Rosen, Nina Davidson and Stephanie Winston Wolkoff hosted their annual lunch with Dolce & Gabbana. The ladies lured their friends to Nello’s Summertime in Southampton, N.Y., with a chance to nab the label’s fall goods at 10 percent off, with 15 percent of sales benefitting Citymeals-On-Wheels and Holistic Chinese Medicine For Pediatric Allergies. It was enough to get women such as Joanne deGuardiola, Christine Schwarzman, Dayssi Olarte de Kanavos, Julie Macklowe and Kim Hierston trying on everything in sight and purchasing what worked. Afterwards, some guests headed for the patio for sustenance in the form of a lovely Italian lunch, while others decided instead to split. “We’ve done our good deed,” said one, skittering away, shopping bag in hand.