If Urban Dictionary had a ‘model off-duty’ entry, Gigi Hadid is probably who you'd see. When she showed up at her mate Taylor Swift's concert in LA this week in an outfit that balanced chill and sexy in equal measure, all our sartorial prayers were answered. To get her look, invest in some sassy jersey staples, like this backless body (slip a cute bra on underneath if you're not into the barely there look) and team with a graphic patterned A-line mini and co-ordinating trainers for an instantly cool sporty feel.