Cannes, May 15 -- Sartorial defiance took on a rebellious hue as the world's most celebrated cinema showcase the Cannes Film Festival unfurled its iconic red carpet along the sun-drenched Croisette.

The updated guidelines, aimed at preventing crowding and maintaining decorum, restrict see-through outfits and "excessively voluminous" dresses with long trains. Halle Berry, dutifully obeyed the restrictions. "I had an amazing dress by (Gaurav) Gupta that I cannot wear tonight because it's too big of a train," the actor said at a news conference. "I'm not going to break the rules."

However, supermodel Heidi Klum and Chinese actor Wan QianHui clearly ignored the new restrictions. While Klum swept in wearing a petal- inspired Elie Saab creatio...