The red carpet has officially been rolled out, and already celebrities are pushing the boundaries of this year’s new dress code on voluminous dresses with long trains.

See all the best red carpet looks from the Cannes Film Festival, which is expected to welcome stars including Tom Cruise, Scarlett Johansson, Kristen Stewart and Robert De Niro. The jury is headed by Juliette Binoche,

There's complex etiquette and a rich history behind the French film festival's red-carpet ban of "naked" or "voluminous" dressing.