Nice costume idea Zeeba, although I know a crafty bastard such as yourself could make a much more authentic robe than that thing...
In the past with robed costumes, I've simply got some nice fabric and a pattern from the craft store, and hot glued it together. It sounds dogey, but the result is MUCH nicer than anything you will buy retail!
Any cloak or a 6-8 piece Jedi robe with the front closed should work perfectly, plus there are many free pattern designs online you could easily adaptI would recommend an over-sized hood with a felt or rough polyester material that will flow nicely, something like
this from an episode of The Mighty Boosh
I was all gung ho to make a HEV suit out of cardboard and multi-colored duct tape(complete with helmet and some fancy LED accent lighting), but meh, I'll probably just recycle an old costume..