Dress in Lairs

The 8 Piece, Tier 2 sets from Blackwing Lair / Molten Core:

[class=1] - Battlegear Of Wrath
[class=2] - Judgment Armour
[class=7] - The Ten Storms
[class=3] - Dragonstalker Armour
[class=4] - Bloodfang Armour
[class=11] - Stormrage Raiment
[class=9] - Nemesis Raiment
[class=5] - Vestments Of Transcendence
[class=8] - Netherwind Regalia

There is no tier 2 for death knights, monks, or demon hunters.
Raids in Vanilla drop specific tier items for each class (instead of later expansions with tokens that span multiple classes).

Tier 2 is an 8-piece set. The drops are split between two raids: [zone=2717] & [zone=2677].

Molten Core:

• Ragnaros - Legs

Blackwing Lair:

• 
  
• [npc=12435] - Bracers
• 
  
• [npc=13020] - Belt
• 
  
• [npc=12017] - Boots
• 
  
• [npc=11983] / [npc=14601] / [npc=11981] - Gloves
• 
  
• [npc=14020] - Shoulders
• 
  
• [npc=11583] - Helm, Chest
• 
  

Criteria of the meta Azeroth's Next Top Model, wowhead wrote up a full guide for the pve sets here.

Dress in Lairs is rewarded for collecting any of the Raid Tier 2 sets which consist of 1 tier set per class and which drop from the bosses in [zone=2677] (except for the leg item which drops from Ragnaros in [zone=2717]).

Dress in Lairs is a criteria of Azeroth's Next Top Model.

Note: [class=6], [class=12] and [class=10] classes do not have a set for this tier.

The other raid tier set achievements:

• 
  
• So Hot Right Now (Tier 1)
• 
  
• Accessor-Eyes (Temple of Ahn'Qiraj/Tier 2.5)
• 
  
• Drop Dead, Gorgeous (Tier 3)
• 
  
• Outlandish Style (Tier 4)
• 
  
• Merely a Set (Tier 5)
• 
  
• Black is the New Black (Tier 6)
• 
  
• Suns Out, Thori'dals Out (Sunwell Plateau)
• 
  
• Undying Aesthetic (Tier 7)
• 
  
• Mogg-Saron (Tier 8)
• 
  
• Style of the Crusader (Tier 9)
• 
  
• Winter Catalog (Tier 10)
• 
  
• Glamour of Twilight (Tier 11)
• 
  
• Hot Couture (Tier 12)
• 
  
• Wardrobe of the Old Gods (Tier 13)
• 
  
• Sha of Fabulous (Tier 14)
• 
  
• Thunderwear (Tier 15)
• 
  
• Yaass'shaarj (Tier 16)
• 
  
• Make it W-orc W-orc (Tier 17)
• 
  
• Extreme Makeover: Fel Edition (Tier 18)
• 
  
• Can I Get A Helya
• 
  
• That's So Last Millennium (Tier 19)
• 
  
• Retro Trend (Tier 20)
•