Aurora of Transcendence Dropped in Blackwing Lair
Lightning Infused Mantle Quest reward from Halls of Lightning. Don't despair if you did this quest and when WOTLK first came out and then vendored these shoulders. The WOTLK dungeon quests have been reset and the quest giver is now inside the entrance of the dungeon.
Robes of the Exalted Drops from Lord Aurius Rivendare in Stratholme
Runed Spell-Cuffs Bought for Justice Points in Shattrath
Frostweave Gloves Crafted by tailors
Nethershard Girdle Dropped by Moroes in Karazhan
Slippers of Serenity Dropped by Exarch Maladaar in Auchenai Crypts
War Mace of Unrequited Love Dropped by Keristrasza in heroic The Nexus
Swamplight Lantern Dropped by Quagmirran in heroic Slave Pens
Alternate version #1. You'll have to find some pants that don't show too much.
Robes of the Guardian Saint Drop from Temple of Ahn'Quiraj
Dawnspire Cord Drops in the Sunken Temple
Alternate version #2, using Replica Virtuous Crown as well as the replicas of the bracers, gloves, and belt from the Vestments of the Virtuous set.
Versions by other people here.