I’ve seen people use the tape method! Silk-screening would be lovely too but I have never done that yet so I wouldn’t know what tip to give you except don’t use a lot of paint for both taping and silk-screening! A little amount goes a long way and you won’t get bulging paint smudges on the side. I’ve also seen someone embroider all the symbols (!)
Unfortunately, anything you add to will always be a little weighed down. In that case, you should try to get the hem to stick out with something like horsehair braid. Linen maintains its shape well but it’s already heavy to begin with so the flow isn’t as great. I used jersey and kona broadcloth and while it weighed down the bottom of the cloak, I put horsehair braid in and stuck my arms out away from me to get the triangular shape.
My tutorial is meant to be a guide like a White Robe traveler, you can follow it or you can wander off on your own :)