The Original

Purchasable from Kezzik the Striker (Netherstorm, BC):

1. 
   
2. [class=11]: [transmog-set=952]
3. Druid
   
4. [class=3]: [transmog-set=714]
5. Hunter
   
6. [class=8]: [transmog-set=734]
7. Mage
   
8. [class=2]: [transmog-set=752]
9. Paladin
   
10. [class=5]: [transmog-set=772]
11. Priest
    
12. [class=4]: [transmog-set=792]
13. Rogue
    
14. [class=7]: [transmog-set=810]
15. Shaman
    
16. [class=9]: [transmog-set=830]
17. Warlock
    
18. [class=1]: [transmog-set=854]
19. Warrior
    

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Prices:

1. 
   
2. Hands = 2x [item=137642]
3. 
   
4. Head = 3x [item=137642]
5. 
   
6. Legs = 3x [item=137642]
7. 
   
8. Shoulder = 2x [item=137642]
9. 
   
10. Chest = 3x [item=137642]
11. 
    
12. Waist = 1x [item=137642]
13. 
    
14. Feet = 2x [item=137642]
15. 
    
16. Wrist = 1x [item=137642]
17. 
    

• 
  
• Total: 17x [item=137642]
• 
  

• 
  
• Ensemble = 12x [item=137642]
• 
  

If you want the achievement and don't have any pieces yet, the ensemble is cheaper.
Consider the two-hour exchange period when you buy parts of the set instead of the ensemble and make sure you get the achievement before selling the item.
You don't need an old pvp rank to purchase these items.

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Achievements for Pvp-Appearences:

• 
  
• Season 1: The Original (BC) (you are here)
• 
  
• Season 2: No Mercy (BC)
• 
  
• Season 3: With a Vengeance (BC)
• 
  
• Season 4: Tough Threads (BC)
• 
  
• Season 5: Lethal Looks (Northrend)
• 
  
• Season 6: The Fierce and the Furious (Northrend)
• 
  
• Season 7: Relentlessly Good Looking (Northrend)
• 
  
• Season 8: Wrath of the Stitch King (Northrend)
• 
  
• Season 9: Viciously Vintage (Cata)
• 
  
• Season 10: (Ruth)less is More (Cata)
• 
  
• Season 11: Cataclysmic Catwalk (Cata)
• 
  
• Season 12: Why Male(volent) Models? (MoP)
• 
  
• Season 13: Dressed to Oppress (MoP)
• 
  
• Season 14: It's Not Fashion Unless It Hurts (MoP)
• 
  
• Season 15: Wear It With Pride (Draenor)
• 
  
• Season 16: Untamed Beauty (Draenor)
• 
  
• Season 17: Wild Style (Draenor)
• 
  
• Season 18: War-Mog-ering (Draenor)
• 
  
• Season 19 or 20: More Like Win-dictive (Legion)
• 
  
• Season 21 or 22: Cruel Intentions (Legion)
• 
  
• Season 23, 24, 25: Claws Out (Legion)
• 
  

If you've purchased the pieces for this set but did not unlock this achievement, either wait 2 hours or delete the items from your bag. It seems like Blizzard delays granting the achievement because you could return the item to the vendor, which would properly remove the appearance, but would not be able to remove the achievement, and you could use a few Marks of Honor to finish every set. Good job Blizzard!

Am I required to play a Class that can equip a set from Classic WoW? I play a Monk. But I would still be interested in collecting these sets for the Achievement points