As any level 50 player will tell you, orange gear is imperative to get in order to prepare your character for endgame raiding. They will also tell you that both orange bracers and belts are difficult to come by as they are not obtainable by crafting or as a reward for completing a normal quest.
Dulfy has compiled an excellent list of ways to get both an orange belt and bracer. You can try your luck using one of these methods, or you can hope someone puts in on a GTN kiosk near you.
http://torsyndicate.com/