It's a toss up between Priest T3, and Druid T9.. My Druid is still wearing around T9 in the city for the look. It's fantastic!
For me the best looking set is druid t6 Thunderheart HarnessI love the looks and it reminds me of a different time, when bears first started roaming the raid instances. I still have the set and use it for screenshots.
It would have to be the tier 1 warrior set (might gear), it just brings back so many great raiding memories and not to mention it looks awesome. I bought the new tanking heirlooms just for the look :)
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Tier 8 is by far the most amazing looking set for every class, Death Knight especially. They all have a very Viking feel to them which just makes me feel like my character is ready to kick the crap out of anything in their path. I haven't seen a single class that tier 8 did not look amazing and simply epic on.
The tier 1 Rogue set "Nightslayer" was my favorite for the 10 energy set bonus. What you could do with that 10 extra energy back at that gear level was nothing short of ridiculous.
Favorite set would probably have to be Paladin T1. I Loved the way it made you look like a giant banana.
As a warlock, I really have to say that Malefic is the best tier set ever. Every piece is beautiful, the wings proc is just epic, and I believe it is overall a very iconic look for warlocks.
Warrior Tier 3 Wrath - BLADES!
I loved tier 10 since its the first set i got while raiding before the gear was outdated. and we all know dk tier 10 was the bomb. i like the paladin t12 too but definitely dk tier 10 with the awesome shoulders.
Warlock T8 Conqueror's Deathbringer Garb The helm just looks awesome.
Tier 1 Paladin was an awesome set, with eight pieces to collect and the unique item bonuses such as 8 piece being able to heal the party and hit was very cool. Definatly an eye catcher also, being fully gold.
The Old T2 Paladin is the most beautifull set ever !
Tier 1. It was the one I drooled over the longest, and worked the hardest to get!