The reason it is not in the game, very few people in the SW universe wore it. The armor could not be made, as it was an ancient form of armor, and the only known person to wear it was Boba Fett. There was one instance of someone that wore it, by the name of Jodo Kast, who impersonated Boba until Fett hunted him down.
So the reason for it not being in the game, is becaues everyone would probably be wearing it, and thus would be going against continuity.
Although it would b kind of cool if you could, but then Fett would b after your *** and strip you of ur armor....