Hercules

I think the characters and costume design in Disney's Hercules really help drive the narrative as the animation is set to explain greek mythology. In the picture there is a God and a Goddess so they naturally are dressed at greek gods and goddesses. We see the style in many portrayals of these times in fine art. The loose cloth tied in the middle, not attached at the sides. 

As for hercules himself he is wearing an armour looking costume which shows that he fights i.e is a hero/god. Also in this film the gods have a glow to them like in stain glass window portrayal of jesus. So this shows people watching it that they are special and gods. This helps drive the narrative because you don't need to work out why this person is glowing because previous experience has suggested that its a god.