Dragon scale armour is created by using dragon scales on a [[large anvil]]. It is improved with [[leatherworking]] tools; however, both creation and improvement uses the [[plate armour smithing]] skill.
Dragon scale armour is tough to make, at 90 platesmithing using a 9799.00QL large anvil you get:9394% on dragon scale jacket
98% on dragon scale pants
99% on dragon scale boots