Cap of the Scarlet Savant

Cap of the Scarlet Savant is cloth head armor with stamina and intellect and improves critical strike chance with spells.

Source
Cap of the Scarlet Savant is a quest reward from the quest Cap of the Scarlet Savant (quest) which starts with Malyfous's Catalogue in Everlook in Winterspring.

Trivia

 * Due to its connection to the Scarlet Crusade, it is rumored that the pattern of this item was originally invented by Archmage Timolain.
 * Until patch 1.6 which brought Blackwing Lair and Mish'undare, Circlet of the Mind Flayer, this item was the only head piece with 2% spellcrit for cloth wearers.