So Hot Right Now

There is no tier 1 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). Each boss should drop 2 items.

Tier 1 is an 8-piece set that drops from the first 8 bosses within [zone=2717].

• 
  
• [npc=12118] - Boots (mage, shaman, paladin, druid), Gloves (warlock, warrior)
• 
  
• [npc=11982] - Legs (all classes from expansion)
• 
  
• [npc=12259] - Boots (hunter, warrior), Gloves (shaman, priest, paladin, rogue)
• 
  
• [npc=12057] - Helm (all classes from expansion)
• 
  
• [npc=12264] - Boots (warlock, priest, rogue), Gloves (mage, druid, hunter)
• 
  
• [npc=12056] - Shoulder (mage, warlock, druid, shaman, paladin)
• 
  
• [npc=11988] - Chest (all classes from expansion)
• 
  
• [npc=12098] - Shoulder (priest, hunter, warrior, rogue)
• 
  
• Belt/Bracers: zone-wide drops, BoE, can also be bought/sold on AH.
• 
  

The penultimate boss, [npc=12018], does not drop any tier.
The final boss, Ragnaros, drops legs for Tier 2.

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

8 piece, Tier 1 sets from Molten Core:

The belt and bracers are BoE and may be traded or found on the Auction House.

[class=1] - Battlegear of Might
[class=2] - Lawbringer Armour
[class=7] - The Earthfury
[class=3] - Giantstalker Armour
[class=4] - Nightslayer Armour
[class=11] - Cenarion Raiment
[class=9] - Felheart Raiment
[class=5] - Vestments of Prophecy
[class=8] - Arcanist Regalia

Part of Azeroth's Next Top Model.
The parts of these tier 1 sets drop in [zone=2717].

1. 
   
2. [class=6]: n/a
3. Death Knight
   
4. [class=12]: n/a
5. Demon Hunter
   
6. [class=11]: [transmog-set=509]
7. Druid
   
8. [class=3]: [transmog-set=531]
9. Hunter
   
10. [class=8]: [transmog-set=553]
11. Mage
    
12. [class=10]: n/a
13. Monk
    
14. [class=2]: [transmog-set=575]
15. Paladin
    
16. [class=5]: [transmog-set=597]
17. Priest
    
18. [class=4]: [transmog-set=619]
19. Rogue
    
20. [class=7]: [transmog-set=641]
21. Shaman
    
22. [class=9]: [transmog-set=663]
23. Warlock
    
24. [class=1]: [transmog-set=685]
25. Warrior
    

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Achievements for PvE-Appearences:

1. 
   
2. Tier 1: So Hot Right Now (Classic, [zone=2717]) (You are here)
3. 
   
4. Tier 2: Dress in Lairs (Classic, [zone=2677])
5. 
   
6. Tier 2.5: Accessor-Eyes (Classic, [zone=3428])
7. 
   
8. Tier 4: Outlandish Style (Bc, [zone=3457], [zone=3923] and [zone=3836])
9. 
   
10. Tier 5: Merely a Set (Bc, [zone=3607] and [zone=3845])
11. 
    
12. Tier 6: Black is the New Black (Bc, [zone=3959] and [zone=3606])
13. 
    
14. No Tier: Suns Out, Thori'dals Out (Bc, [zone=4075])
15. 
    
16. Tier 7: Undying Aesthetic (Northrend, [zone=3456])
17. 
    
18. Tier 8: Mogg-Saron (Northrend, [zone=4273])
19. 
    
20. Tier 9: Style of the Crusader (Northrend, [zone=4722])
21. 
    
22. Tier 10: Winter Catalog (Northrend, [zone=4812])
23. 
    
24. Tier 11: Glamour of Twilight (Cata, [zone=5334], [zone=5638] and [zone=5094])
25. 
    
26. Tier 12: Hot Couture (Cata, [zone=5723])
27. 
    
28. Tier 13: Wardrobe of the Old Gods (Cata, [zone=5892])
29. 
    
30. Tier 14: Sha of Fabulous (MoP, [zone=6297] and [zone=6067])
31. 
    
32. Tier 15: Thunderwear (MoP, [zone=6622])
33. 
    
34. Tier 16: Yaass'shaarj (MoP, [zone=6738])
35. 
    
36. Tier 17: Make it W-orc W-orc (Draenor, [zone=6967] and [zone=6996])
37. 
    
38. Tier 18: Extreme Makeover: Fel Edition (Draenor, [zone=7545])
39. 
    
40. Tier 19: That's So Last Millennium (Legion, [zone=8025])
41. 
    
42. No Tier: Can I Get A Helya (Legion, [zone=8440], you want the Ensemble)
43. 
    
44. Tier 20: Retro Trend (Legion, [zone=8524])
45. 
    
46. Tier 21: Argussy Up (Legion, [zone=8638])
47.