Obi-Wan Kenobi - Pants

This is the easiest part of the costume. Obi-Wan's trousers were made from a light khaki cotton material. Pants found in a clothing store will work since the pockets will be covered by the tunic, as long as the seam on the side is thin.

If you're looking for an easier way to match the color of the pants and shirts, just pick up a generic pattern for pants from your fabric store and make them yourself. You'll probably even save a few dollars.