The Witcher 2: Assassins of Kings
Shiadhal's armor can be looted from the body of Bernard Loredo during the quest Death to the Traitor!, or purchased from the mysterious merchant.
Its name suggests a connection with Shiadhal.
The Witcher 3: Wild Hunt
Shiadhal's armor returns as light armor in the third game.
Shiadhal's armor (crafted)
Crafting Requirements
Shiadhal's armor (relic)
This armor can be found as random loot.