You've got your ticket to Splendour, AKA the festival of the year. Nice one! Next up, what are you going to wear? The answer is denim. Customised denim, in fact: frayed, patched up and painted any way you please. With just jeans, a jacket and a skirt, let DIY kween and ASOS Student Insider Asha school you in three ways to smash the trend…