Making a Jedi Costume
The Jedi costume is popular for Halloween, cosplay, and theme parties. The costume is very flexible and allows for a lot of personalization. This is a page about making a Jedi costume.
This site has clearly written step-by-step instructions for making a homemade Jedi robe and tunic. It explains very well how to customize the size so it will fit you correctly after assembly.
Here is a site that instructs you on how to make a very authentic Jedi Robe and costume. It walks you though making the robe, outer tunic, inner tunic, belt and more.
It even has a quick low budget option.