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

While nudity was never previously endorsed at the festival, Cannes updated its dress policy on the eve of its 78th edition to read that “nudity is prohibited on the red carpet, as well as in any other area of the festival.

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.