Crocheting is more often associated with the WI or 1970s hippie fashion rather than a fashionable poolside look. But this summer’s sell-out swimwear style is a teeny weeny crochet bikini — and it’s already an Instagram star. The jet set is in agreement: the must-have bikini is by Kiini.

The hand-stitched two-piece, which costs £245, was created by the Turkish-American designer Ipek Irgit and comes in bright neon colours.

The singer Ellie Goulding and models Cara Delevingne and Heidi Klum have been seen in the bikini, as have the Victoria’s Secret models Stella Maxwell and Irina Shayk. Styles of the bikini have sold out at the luxury retailers Browns, Avenue32 and Matchesfashion.com.

The label’s popularity is partly down to Instagram, where the hashtag “Kiini” has been tagged more than 12,000 times. The actress Dree Hemingway, model Bar Refaeli and fashion editor Anna Dello Russo have all posted selfies featuring the brand on the photo-sharing app.

A clutch of copycat designs are flying off shelves on the high street.

River Island, Whistles and H&M now offer bright crochet swimwear. Missy Empire’s crochet design, which costs £32, sold out in 24 hours and has been restocked three times since.

“Kiini’s colourful bikinis make a statement and their crochet design is instantly recognisable on Instagram, which has created a definite buzz about the brand,” says Laura Larbalestier, the buying director at Browns.

The selling power of the bikini selfie was demonstrated by Taylor Swift this week. Online searches for the £100-plus Solid & Striped swimwear worn by the singer and her gang of A-list friends in social media posts on Monday have increased by 100 per cent, according to Shopstyle.com.

The stylish destination to be seen in your bikini this summer? On Instagram — no pool or beach required.