Elizabeth von der Goltz is Net-A-Porter's global buying director - which means it's her job to oversee every piece that hits the e-tail giant's virtual shelves, sifting the forever from the flash-in-the-pan and identifying the next big thing before anyone else.   She talks to the Telegraph's Charlie Gowans-Eglinton about trend-predicting, her own shopping habits, and how she got the biggest job in the business.   Subscribe and give us a five star review on Apple Podcasts - and let us know what you think at [email protected] and www.telegraph.co.uk/fashion-unzipped-podcast/.   Come and see Charlie at Stella Live in London on 10th and 11th May. Tickets at www.stellalive.co.uk.