From the months of June to August, Kylie Jenner – and most of the Kardashian / Jenners, come to think of it – ditch their designer garms and red carpet ball gowns in favour of almost exclusively swimwear. Ya know, when they're not wearing the latest must-have trends be it bubble skirts or white mini dresses.

Be it plunging one-pieces, cut-out monokinis or tiny string micro bikinis, the famous family has an extensive beach attire wardrobe. So why would they bother wearing anything else, tbh?

Showcasing yet another ‘kini in her swimwear arsenal, Kylie took to Instagram to share a series of pics from a photoshoot as part of a social media campaign for her drinks brand, Sprinter. Accompanied in the snaps by her two BFFS Anastasia 'Stassie' Karanikolaou and Victoria Villarroel, all three can be seen wearing two pieces in varying colours.

And while their tops are the classic and ever-favoured triangle style, it was the trio's bikini bottoms that caught our attention. Sound the fashion klaxon because Kylie just debuted a new swimwear trend, right in time for summer and bikini szn.

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Featuring a two-tone double design, the bottoms look like they are two separate pairs that have been layered one over the top of each other with the thin side straps worn at varying heights on the hip. A custom-made creation from swimwear brand Oséeree, Kylie reps a navy blue and gold 'kini, while Stassie wears an orange and pink creation and Victoria's style features two shades of green.

"We love experimenting with new products all the time. We managed to create a custom-made fabric, starting with a simple tulle. We dyed the fabric to achieve the colour we wanted and we added a touch that has always distinguished Oséree: a metallic lamina to always be glow and shiny," brand founders Isabella Cavallin and Jannine Vinci explained to Cosmo.

"From there, we decided not to line the fabric with lycra as we would normally do, but to play with transparencies, thus combining two colours and consequently two bikinis!" The result is a fun and sexy new bikini style, oozing '80s fashion retro charm while being super contemporary.

Upon closer inspection, it appears the topos also feature a double strap feature, though less obvious than the bottoms' design detail. Yep, of course Kylie was ahead of the trend, yet again.

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Alexandria Dale

Alexandria Dale is Digital Fashion Writer at Cosmopolitan & . Covering everything from the 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 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!