Fashion at Cannes is often unpredictable but can throw out some fantastic micro trends. On day two, 12 May, it becomes apparent that suiting is one of them.

Looking effortlessly sophisticated, Julia Roberts stepped out for a photocall for Jodie Foster's upcoming movie Money Monster, which she stars in with George Clooney. With the sun beaming down on the French Riviera, Roberts confidently strode out in a Givenchy pre-fall pinstripe jumpsuit and crisp white shirt with Christian Louboutin stilettos.

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Julia Roberts in a Saint Laurent suit ensemble at Cannes 2016. Getty

Roberts wasn't the first to step out in a suit, with Susan Sarandon's effortless mastering of a loose tailored look at the premiere of Woody Allen's latest film Café Society.

Hitting the red carpet of the Palais des Festivals in a laid-back but sharp Saint Laurent suit and white shirt, accessorised with black cat-eye sunglasses and pointed flats, Sarandon looked suitably slick.

The absence of a high heel is the epitome of power dressing, particularly after last year's 'heel gate' debacle in which a group of women in their 50s were turned away from a screening of Carol in Cannes for not wearing them. At the time, Emily Blunt spoke at a press conference for her film Sicario saying: "Everyone should wear flats, to be honest."

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Susan Sarandon looks sharp in Saint Laurent and flat shoes at Cannes 2016. Getty

No stranger to the suit, Sarandon caused a sartorial storm in a D-cup at the Screen Actor's Guild awards last year, wearing a white tuxedo jacket and culottes with the hint of an exposed black bra beneath. The monochromatic look was challenged for being too revealing, though it was a lot less racy than many of the looks which graced the red carpet last year.

Another Cannes 2016 star to eschew the billowing gown in favour of some expert masculine tailoring is Victoria Beckham. The designer arrived at the opening ceremony last night in a strapless jumpsuit with long-line ruched trousers by her own label, accessorised with a hoard of Chopard diamonds. Her smoky-eyed make-up came courtesy of the designer's beauty collaboration with Estee Lauder, which had its debut at the event's opening.

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Victoria Beckham wears Victoria long-line trousers and Chopard diamonds at Cannes 2016. Getty