Jeans are easily the most worn item in our wardrobe year-round, but in the summer, they tend to take a back seat in favour of more comfortable trousers. Think loose linen looks and cool cargo designs that tap into the easy, breezy sense of dressing we adopt as our warm-weather aesthetic.
Amongst these trouser trends, we've noticed one particular style gaining more traction than its contemporaries: cobalt blue trousers. The bright, bold hue was spotted all over the spring/summer 2026 runways at the likes of Victoria Beckham, Loewe, Jil Sander, Chanel and more. Naturally, the shade has been a standout on the high street, too, but the past few weeks have proved the best way to wear it. At least according to the coolest of fashion girls.
With Nothing Underneath's cobalt cotton trousers, the hero item from the brand's capsule collection in collaboration with Lucy Williams, sold out almost instantly. LA-based loungewear brand, Leset's Kyoto Carpenter Pant had a similar fate after Monikh was spotted wearing them. And finally, Zara's cobalt cargos must have set a new record for sell-out speed after both Alice Satterthwaite (AKA The Alice Edit) and Gabrielle Luksaite spotlighted them on their Instagram feeds.
Luckily, there are still plenty of cobalt blue trousers populating the high street. Top of our wish list are this Mango pair that nail the effortless vibe with their drawstring waist, straight-leg silhouette and, of course, punchy colourway. Made from ramie, a renewable plant fibre that has a silky and lustrous finish, they tick extra style points for their sustainable credentials.
Mango 100% Ramie Trousers with an Overdyed Effect
Or, shop more of our favourite cobalt blue trousers available right now:
Topshop Linen Straight Leg Trouser with Deep Cuff
Hush Juno Seersucker Cotton Barrel Leg Trousers
River Island Linen Rich Drawstring Wide Leg Trousers
Next Blue Stripe Cotton Linen Blend Barrel Leg Trousers
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Alexandria Dale is the Digital Fashion Writer at Cosmopolitan UK. Covering everything from the celebrity style moments worth knowing about to the latest fashion news, there’s nothing she loves more than finding a high street dupe of a must-have designer item. As well as discovering new brands, she’s passionate about sustainable fashion and establishing the trends that are actually worth investing in. Having worked in fashion journalism for six years, she has experience at both digital and print publications including Glamour and Ok!
