I believe that the tunic was a twill fabric and the pants were a cotton. The waist wrap was vinyl covered in twill (so it’s quite stiff and stands up flat). All designs on the tunic/wrapping were hand-painted with acrylic paint (takes several layers to “pop” XD).
Making the tunic is just like making a long shirt with a wide collar. Use any t-shirt you have as a pattern and make it bigger/longer on the bottom. Also make the sleeves long of course. The pants are very basic sweatpants. The wrapping is two pieces of red twill sewn together (like a pillow-case in a way) and then a fitted vinyl strip is slipped inside. You’ll need velcro or something to attach it in the back ;)
Hope this helps! Best of luck