A pinch-cheeked prepster in a striped polo frolicking with her good-looking friends among the Brooklyn Brownstones. It could have been an advertisement for Polo Ralph Lauren, had it not, in fact, been an advertisement for Gigi Hadid’s business Guest in Residence. The multi-hyphenate model was yesterday afternoon photographed in one of her £495 rugby tops with a cashmere sweater tied around the waist of her all-American jeans. (This was a look merchandised more than styled.)