Want to become as Star Wars Jedi for this Halloweens? You can with the Jedi Robe from ThinkGeek. Not only will you look authentic, get one of these lightsabers (btw, are really cool stuff)to engage in combat too. These are officially licensed, meaning they are as real as they get.
Also check out these “real” lightsabers, they are too dangerous to carry around in real life though.
Officially licensed, no less. Buy the robe, and you can spend the time you would have spent making it scrounging up the other bits of your costume like the obi or the tabards. And the boots. Don’t forget the boots. Ain’t nothing worse than seeing a spectacular Jedi costume finished off with a pair of sneakers.