As the time came for stylist-to-the-stars Karla Welch to pick a face for her T-shirt collaboration with high street brand Hanes, it could only ever have been Justin Bieber. After all, the Love Yourself singer was the catalyst for the Hanes x Karla line of seven classic white tees in the first place.

Legend goes Welch, who styled the Bieber for his Believe Tour in 2012, approached the cut-price basics brand back then to custom-make white shirts for the star, given she couldn’t find baller-style white tees that were long enough for his taste but still narrow enough to fit.

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Bieber (partially) wears the Original style in the campaign shot by Karla Welch’s husband Credit: Instagram @karlawelchstylist, Matthew Welch (photographer)

Twigging that it was onto a good thing, the brand agreed to let Welch tweak its bargain basement line of T-shirts, which currently sell for between $7 and $10 Australian dollars on the Hanes website, then sell the co-branded result on her own website.

The seven new styles of tee – in original, sleeveless, cropped, crew, classic, sleeveless cropped and baby cuts – are only available (for now) at several pop-up stores in America and online at  XKarla. Any one of them could easily be the most worn piece of clothing you own all summer.

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Joan Smalls wears the Sleeveless Crop style Credit: Matthew Welch via Instagram @karlawelchstylist

Along with the shape, Welch has adapted the price too: each is listed for US$30, or almost $40 Australian post-conversion, a 300 percent markup on the Hanes originals. (We see you, celeb-factor inflation). Still, it’s a far cry from the hefty price tag other singer-slash-designers like Kanye and Rihanna have added to their own basic T-shirt offerings in recent past.

Supermodels Joan Smalls and Kaia Gerber – chosen because they also encapsulate the youth-centric, street cool vibe Welch injected into the range – join Bieber in the black and white campaign, shot by the stylist’s photographer husband Matthew Welch.

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Kaia Gerber, whose mother Cindy Crawford has worked with Welch in the past, wears the Crop Credit: Matthew Welch via Instagram @karlawelchstylist

“Karla and I have always pushed boundaries together and this collaboration is a continuation of that,” Bieber has said of endorsing wares for Welch, who’s switched from being his fashion advisor to a close friend. Rumour is a second range will drop in October. Whether or not Bieber appears partially bare-chested in its ad campaign again remains to be seen.