SIENNA MILLER JUST WORE THE PERFECT HEATWAVE OUTFIT FORMULA – AND IT’S SO EASY TO COPY

Newsflash: it's getting hot. Seriously hot. And with soaring temperatures expected today and tomorrow before it cool downs, now's the perfect moment to test-drive your heatwave wardrobe before the mercury properly spikes this summer (here's hoping). For anyone wondering how to style it out, especially if heading to the office is on your agenda, Sienna Miller has the solution in the form of the ideal formula when the forecast is set to sun.

On the promo trail for her new film Horizon, Miller stuck to a tried-and-tested trend that's already seen several endorsements from the A-list: the all-white outfit. If that doesn't sound entirely practical, the actor's separates were eminently easy-to-wear - a white scoop-neck tank top and white trousers that looked smarter than cargo pants but more lo-fi than tailored pants (Reebok's Club C trainers added to the look's relaxed appeal).

Chic accessories were also on the menu in the form of violet-tinted lenses, a straw tote that could easily double as a summer laptop bag and gold hoop earrings (the kind you could wear summer in, summer out with everything from waistcoats and wide-leg jeans to baby tees and Bermudas). Sienna Miller, we salute you.

Shop: Sienna Miller's Heatwave Outfit

Natalie Hammond is Grazia’s Senior Fashion News Editor. She loves winter, hates summer and can often be found writing about the weather (and what on earth to wear).