The previous tabard shown as it would be worn-- snapped together. I believe the obi and belt will hide the snaps. It was suggested to attach the tabard to the outer tunic at the shoulders to be able to put it on as one garment.
DIY-Anleitung: Star Wars: Jedi-Robe nähen via DaWanda.com
Jedi tunic, undertunic, tabard, and belt. I wonder if the tabard is necessary. My sister has a wide leather belt that has interesting shapes. It's brownish-red so I think she would need a lighter color under it.