Tier ID list by Gallopokoii

Warrior:

Tier 1:
Battlegear of Might: --> ".additemset 209"

Tier 2:
Battlegear of Wrath: --> ".additemset 218"

Tier 3:
Dreadnaught's Battlegear: --> ".additemset 523"

Tier 4:
Warbringer Armour: --> ".additemset 654"

Warbringer Battlegear: --> ".additemset 655"

Tier 5:
Destroyer Battlegear --> ".additemset 657"

Destroyer Armour --> ".additemset 656"

Tier 6:
Onslaught Battlegear --> ".additemset 672"

Onslaught Armour --> ".additemset 673"

Mage:

Tier 1:
Arcanist Regalia --> ".additemset 201"

Tier 2:
Netherwind Regalia --> ".additemset 210"

Tier 3:
Frostfire Regalia --> ".additemset 526"

Tier 4:
Aldor Regalia --> ".additemset 648"

Tier 5:
Tirisfal Regalia --> ".additemset 649"

Tier 6:
Tempest Regalia --> ".additemset 671"

Hunter:

Tier 1:
Giantstalker Armour --> ".additemset 206"

Tier 2:
Dragonstalker Armour --> ".additemset 215"

Tier 3:
Cryptstalker Armour --> ".additemset 530"

Tier 4:
Demon Stalker Armour --> ".additemset 651"

Tier 5:
Rift Stalker Armour --> ".additemset 652"

Tier 6:
Gronnstalker Armour --> ".additemset 669"

Warlock:

Tier 1:
Felheart Raiment --> ".additemset 203"

Tier 2:
Nemesis Raiment --> ".additemset 212"

Tier 3:
Plagueheart Raiment --> ".additemset 529"

Tier 4:
Voidheart Raiment --> ".additemset 645"

Tier 5:
Corruptor Raiment --> ".additemset 646"

Tier 6:
Malefic Raiment --> ".additemset 670"

Shaman:

Tier 1:
The Earthfury --> ".additemset 207"

Tier 2:
The Ten Storms --> ".additemset 216"

Tier 3:
Teh Earthshatterer --> ".additemset 527"

Tier 4:
Cyclone Regalia --> ".additemset 632"
Cyclone Raiment --> ".additemset 631"
Cyclone Harness --> ".additemset 633"

Tier 5:
Cataclysm Raiment --> ".additemset 634"
Cataclysm Regalia --> ".additemset 635"
Cataclysm Harness --> ".additemset 636"

Tier 6:
Skyshatter Raiment --> ".additemset 683"
Skyshatter Regalia --> ".additemset 684"
Skyshatter Harness --> ".additemset 682"

Paladin:

Tier 1:
Lawbringer Armour --> ".additemset 208"

Tier 2:
Judgement Armour --> ".additemset 217"

Tier 3:
Redemption Armour --> ".additemset 528"

Tier 4:
Justicar Battlegear --> ".additemset 626"
Justicar Raiment --> ".additemset 624"
Justicar Armour --> ".additemset 625"

Tier 5:
Crystalforge Battlegear --> ".additemset 629"
Crystalforge Raiment --> ".additemset 627"
Crystalforge Armour --> ".additemset 628"

Tier 6:
Lightbringer Battlegear --> ".additemset 680"
Lightbringer Raiment --> ".additemset 681"
Lightbringer Armour --> ".additemset 679"

Druid:

Tier 1:
Cenarion Raiment --> ".additemset 205"

Tier 2:
Stormrage Raiment --> ".additemset 214"

Tier 3:
Dreamwalker Raiment --> ".additemset 521"

Tier 4:
Malorne Raiment --> ".additemset 638"
Malorne Harness --> ".additemset 639"
Malorne Regalia --> ".additemset 640"

Tier 5:
Nordrassil Raiment --> ".additemset 642"
Nordrassil Harness --> ".additemset 641"
Nordrassil Regalia --> ".additemset 643"

Tier 6:
Thunderheart Harness --> ".additemset 679"
Thunderheart Regalia --> ".additemset 677"
Thunderheart Raiment --> ".additemset 678"

Rogue:

Tier 1:
Nightslayer Armour --> ".additemset 204"

Tier 2:
Bloodfang Armour --> ".additemset 213"

Tier 3:
Bonescythe Armour --> ".additemset 524"

Tier 4:
Netherblade Armour --> ".additemset 621"

Tier 5:
Deathmantle Armour --> ".additemset 622"

Tier 6:
Slayer's Armour --> ".additemset 668"

Priest:

Tier 1:
Vestments of Prophecy --> ".additemset 202"

Tier 2:
Vestments of Transcendence --> ".additemset 211"

Tier 3:
Vestments of Faith --> ".additemset 525"

Tier 4:
Incarnate Raiment --> ".additemset 663"
Incarnate Regalia --> ".additemset 664"

Tier 5:
Avatar Raiment --> ".additemset 665"
Avatar Regalia --> ".additemset 666"

Tier 6:
Vestments of Absolution --> ".additemset 675"
Absolution Regalia --> ".additemset 674"