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Warlock T5 FTW! My main is a Warlock and ive been playing since BC
Personally, Bloodfang Armor Tier Set was my favorite (Was only the few Gnome Rogues especially female walking around with it on). Enjoyed walking around with my set especially with the Helmet. First seeing the graphic back then was unbelievable. Yes, the 5/8 set bonus was nice because I always needed to use Feint alot...All I have to say Vanilla's Set's had the best Tier Graphics, but that's my opinion.
Tier 1 warrior set! Just because it's so nostalgic for me.
My favorite tier set would have to be T2 Judgement for paladins, it was the most epic looking set back in classic.
Priest tier 6. This is my favorite set because it marks the period in my growth as a player where I really figured out how to play the game. :)
My favorite set is the Tier 5 Priest set because it looks like an angel. :) It is my favorite set to wear just for fun!
Druid T9 Feral DPS set Malfurion's BattlegearLoved it as it was my first Raid set, and was dearly loved until it became sorely outdated.
My favorite tier set was the Death Knight Tier 10 gear. It had good stat bonuses for the level of gear, and it just looked completely badass, except for the helm. the new Tier 11 DK gear looks too garish.
Druid Tier 1. I know lots of people will disagree, but I'm not saying that particular set because I think it's the "coolest" looking, but rather for sentimental reasons. It was the first set I ever got in WoW and I have fond memories of those vanilla days, working hard to earn that set. Plus, I think that despite that many other druid sets are better looking, it's the most "druidy" looking one in my opinion and I love it for that.
I really liked Battlegear of Might because it looked the best back then and it actually looked like armor and it was used on NPC Saurfang which was the icon of the horde. Also they reintroduced it back into the game has a heirloom tanking set which makes me drool in sheer awesomeness.
My favorite is Tier 5 Hunter, Riftstalker. I loved the lightning spell effect on the shoulders.
My favorite tier set for my druid is Tier 2, Stormrage. I think it looks amazing and goofy, and the only set that truly makes me feel like a druid.
While I'm not a huge fan of fire in general, hunter T12 piece takes the cake. Even if hunter's have a weird fetish for making headgear out of dead things...
I'd have to say the Tier 10 (heroic) Mage set because of all the fantastic memories that are associated with it.