News editor Harriet Walker on her Rick Owens jumper

That's right – I'm wearing a jumper. In this heat! The thing is, my jumper is a bit like one of those magical gym tops (did someone say sportswear? ugh) which keeps you warm when you're cold and cool when you're hot. As well as being a master of cool, Rick Owens has also somehow managed to defy physics. Why means, if you wear this lightweight jumper with a summery skirt, you're all set for sunshine (without showing too much white flesh). And if you throw it over some skinny jeans, it'll see you through autumn too. It's ideal for all these 'air-conditioning days'.