When you complete the following tasks the corresponding bonus feature will become available.
Classic Order Costume:
Complete Story on Apprentice/War Mage difficulty.
Complete Story mode (War Mage only).
Complete Story mode (Sorceress only).
Knight of the Order Costume:
Complete Story mode on Nightmare difficulty setting.
Complete a campaign on Apprentice/War Mage difficulty setting. Nightmare difficulty is unlocked separately for each campaign: Story, Classic, and DLCs.
Added by: Sanzano Oct 5th 2012, ID#17474