Jedi are citizens of the Star Wars galaxy who are trained to use the "Force" as a means of peace and justice in the universe. The oldest are Obi Wan Kenobi, Qui-Gon Jinn and Yoda. Yoda provided most of the training for Luke Skywalker. Since the movies jump around through time, it can be hard to keep track of who came first, be rest assured, true Star Wars fans know everything about the Jedi, including the best look for Jedi costumes.
They are essentially brown robes with a light colored tunic underneath. Variations exist with specific characters. Choose Obi Wan Kenobi so you can be the master of the Jedi Knights; Luke Skywalker so you can be the son of Darth Vader and the leader of the Rebel Alliance, and the Anakin Skywalker so you can be Luke's father in the days before he turned to the Dark Side. However, no one says they are only humans. You can always be Yoda. He is of a species unknown but the little green guy is the most notable Jedi. The Yoda Costume features a cream colored robe and a green Yoda mask. These are available for toddlers, boys and men. Women and girls can wear something too in the form of the Princess Leia and the Padme Amidala.
People young and old can wear a full line of officially licensed Star Wars Jedi costumes for Halloween or for a Star Wars convention. All accessories such as Light Sabers which are also sold here, will give you what you need to have the force be with you.