I really like the T11 DK set, just because of the evil look and awesome shoulders. xD
Warlock tier 6 was and still is the best looking if you ask me.I remeber meeting a Blood elf in full tier 6 as a paladin and somewhat you became scared of him.And that's what warlocks are all about FEAR.
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Frostfire Regalia - Mage T3 set.Might not be the best looking anymore, but God, whoever was wearing that pre-BC was the sexiest character ingame.Also the only gear set that looked as sexy and jaw-dropping in-game as on screenshots.
My all time favourite tier set was the Bloodfang Tier 2 rogue gear from Blackwing Lair, that stuff on my human rogue was just too cool in comparison to any other set that was ever made after :P
My favourite tier was Shaman 5. I liked the whole molten armor look of it, plus if you managed to get the Fists of Molten Fury set you had the most badass item set combo available in the game.
Death Knight - Magma Plated Battlegear (Tier 11) is best.Skull Head with Crown looks awesome. Coz of it i changed my main character into a DK. :D
My personal favorite is the rogue t10, aside the mask. It actually makes you look like this leather clad stealth assassin, that utilized poisons, it just screams rogue.
My favorite set is the shaman's skyshatter tier 6 set Skyshatter RaimentThat's how a shaman gear should look like and that's how I've imagined a shaman in WoW - lightning spreading from his body AWESOME ! : )
Bloodfang was definitely my favourite! The shoulders are quite possibly my favourite item in the game ^^
I like warlocks Sanctified Dark Coven's Regalia Tier 10 set. Most awesome helm in the game! And those details on chest, shoulders and hands.. just perfect! Blue, green or red colour - doesn't metter, suits to all races!
The tier 11 mage set is definitely scary looking. Your head is on fire. This is my favorite. I can't stop looking at it!
For me best was rogue t5, ahh that shady - skull mask and his spiky pauldrons, good old times..
I like the current one because it's the only one i had(i started playing in Cata).