|Able to turn into when un-rusted:
Use a rust remover to un-rust the armor. This armor can also be obtained by using one of the quest crates in Yalahar or Thais.
NOTE: It is not recommended to waste Rust Remover on the common rusty armors, since the chances of getting a Brass Armor, Plate Armor or Knight Armor is very low. If you would use 100 rust removers you would get an average of 11.050gp, while 100 rust removers cost 10.000gp. So your profit isn't really worth the effort.
Can be obtained through the The Hidden City of Beregar.