I dont have any codes or even a full list (I only play Squishies and Tanks) so here's the armor and weapons for Paladins, Warriors, Mages, Priests, and Warlocks. For the rest, you can bring back Tier 2 or use the Dungeon 3 sets.
Plate:
Head - Irondrake Faceguard
Chest - Breastplate of Righteous Fury
Chest - Crimsonforge Breastplate
Bracers - Vambraces of Daring
Bracers - Virtue Bearer's Vambraces
Gloves - Thatia's Self-Correcting Gauntlets
Gloves - Life Bearer's Gauntlets
Legs - Cassock of the Loyal
Legs - Bloodlord Legplates
Boots - Boots of Righteous Fortitude
Boots - Obsidian Clodstompers
Shoulders - Spaulders of Slaughter
Belt - Girdle of Many Blessings
Belt - Girdle of the Immovable
Cloth:
Head - Mage-Collar of the Firestorm
Head - Scintillating Headdress of Second Sight
Chest - Warp Infused Drape
Chest - Robe of Effervescent Light
Bracers - Arcanium Signet Bands
Bracers - Light Scribe Bands
Gloves - Gloves of the Deadwatcher
Gloves - Hands of the Sun
Gloves - Prismatic Mittens of Mending
Legs - Leggings of the Sacred Crest
Legs - Pantaloons of Flaming Wrath
Boots - Embroidered Spellpyre Boots
Shoulders - Mindrage Pauldrons
Belt - Oracle Belt of Timeless Mystery
Weapons:
Healing Mace - The Essence Focuser
Healing Off-Hand - Lordaeron Medical Guide
Healing Shield - Stromshield of Renewal
Tank Shield - Blood Knight Defender
Tank Sword - Warp-Storm Warblade
Caster Staff - Warpstaff of Arcanium