Jabots can be designed in many styles, most often they are knife pleats turned outward. Jabots are normally 9-15 inches wide and taper upwards in the inner edge. They are placed on the outsides of a window treatments with a mirror image. The jabot length should be about 1/3rd to 2/3rds of the window treatments. It’s lower inner point will be lower than your center point of the swag treatment.
You will fine there are many ways of fabricating a jabot or a cascade. Discover the basic methods to make a Jabot or Cascade Treatment
The photo is from Drapery Solutions in Litchfield Park, AZ