Nicole Leybourne’s designer jumpers are so sought after, she’s had to hire a team of knitters across the country. Words: Nicole Barratt Just months ago, a girl from New Zealand found herself on the 25th floor of Vogue’s offices, “a sweaty mess” in her handmade chunky knit jumper. She was clutching a rack of woolly garments and fanning herself in New York’s heat, when Anna Wintour stepped out of a lift, and Grace Coddington stepped in. Nicole Leybourne had just lugged two suitcases stuffed with 20 of her handmade sweaters through the Conde Nast basement and security - home to