CHORUS
The chorus was a group of members from that musical/production joining together dressed exactly the same with the same masks and robes (costumes) to re act a scene or song from that specific show. Whatever the genre may be you would still find a chorus somewhere in there, either playing one of the lead rolls of hidden somewhere in the background.
As you can see in the small paragraph above there is a chorus, they are all In the same mask and the same Clothing. In some not all they might have the same hairstyle or there might be 2 or 3 different found styles in there.