Halloween Costume Ideas

So I want to go as my Sith Marauder from Star Wars: the Old Republic for Halloween. He is the Hand of the Emperor, a personal assassin and warrior, only going by the alias "The Marauder". I named him "Darth Ravigious". I've already decided that I would jell my hair back and find a respirator to wear, but does anyone have an idea on how to make robes and armor inexpensively?

I am known as "The Costume Man" at school, and I need to keep up to standard if I am going to hold the title this last year. I desperately need ideas on how to make armor and robes.

I'm gonna dress up as Darth Timmyjake.

Ok so, this is a great idea for people who don't know what they are going to be for Halloween.

So, I have a problem. We will have a Halloween dance at our school. Not the same day as Halloween though. So, I will have to purchase two costumes. I was thinking a vampire for one night and a zipperface the other night. So here is the problem, I don't know which night I should wear the costumes. Just please give me suggestions!

Spots, those robes look just like a long-sleeved dress. Find a gray dress, staple the bottom pattern on (just print it with paper), as well as the collar. The belt and the arm thingies, construction paper/cardstock should work, along with some crayons to color them.
That should do it.
Good luck finding a plain gray dress that fits

Really though, those robes look just like my choir dress from last year, except my dress was black and had short sleeves. (which might not sound like a lot of similarity, but it is.)