If its style credentials have been questioned in the past, there's no doubt that double denim is finally getting the recognition it deserves. Julia Fox and Ye - the hottest pair at Paris Fashion Week - turned up wearing matching true blues, putting their spin on the most infamous double denim outing of all time (Justin and Britney).
Their partnership might not have survived, but the fate of double denim was sealed - and the verdict was steer clear. A few years later, however, it got its mojo back. Sienna Miller started pairing her skinny jeans with denim waistcoats; Rihanna wore tailored denim two-pieces to parties.
These outfits brought back memories of double denim done right, back in the Nineties, when faded indigos and well-loved jean jackets used to be the off-duty wardrobe of supermodels (Naomi Campbell) and actors flying into LAX (Gwyneth Paltrow).
Which brings us to today, where street-stylers at last season's shows continued the theme, mostly pairing their oversized denim shackets with straight-leg jeans or tucking a denim button-down into wide-leg flares. Bella Hadid even showed off triple denim on Instagram last year, pairing her baggy jeans with an oversized shirt and coat thrown over the top.
Careful additions - like a thick leather belt, a patchwork shoulder bag or a sharp pair of pumps - will give the uniform some personality, as will a well-chosen pair of ankle boots (squared-toe and block-heeled or chunky-soled).
A denim waistcoat might be a step too far into cowboy territory, but B Sides, who actually upcycles denim from the American West,has an amazing jean jacket with a detachable mohair waistcoat(two for the price of one).
While Rihanna wore matching indigos for an outing in 2017 - and looked fabulous - my advice would be to mix and match your shades of denim so that the look reads as effortless as possible (white or black denim also goes with every variation of blue so is an excellent place to start). Ganni, however, has a bleached jacket and matching jeans that just needs some diamanté earrings and spangled heels to look disco-ready, proving that when it comes to double denim, the rules are, there are no rules. Keep scrolling for our favourite double denim formulae.