Online retailers have been particularly hard hit by the stock market slump in technology stocks after the high-profile collapse of sportswear and fashion retailer boo.com in May.

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When Joseph Altuzarra launched his clothing line, Altuzarra, in 2008, New York fashion was dominated by pretty, polite dresses and casual sportswear and he was tired of it.

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Burch, CEO and designer, has never bought into the notion that great fashion has to be raw or edgy, instead proving that classic sportswear can be just as influential and develop a devoted following.

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Which is why when Adidas approached Stella McCartney to design a line of sportswear for the company, eyebrows were raised in both the fashion and sports worlds.

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Collaborations in recent years with avant-garde designers such as Bernhard Willhelm and Damir Doma, as well as a more recent partnership with luxury French winter sportswear label Moncler, have helped to cement the label's reputation in the fashion world.

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