This example uses a princess seam to demonstrate how to set a godet, but godets can also be set into solid panels of fabric. This alternative method is discussed briefly in the video.
Godets are essentially a section of a circle and can add as much flare to a garment as you want. If patterning a godet, it is a good idea to test the amount of volume you are adding. At a certain point, godets collapse in on themselves, making it hard to see the full volume. This excessive volume is only good for movement.