As a rogue, I've just come up with 82.42% avoidance unbuffed against a boss mob.
With full raid buffs I'm seeing 108.6% avoidance possible.
At least that is what
lootzor showed me, there may be some other choices.
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Rogue 100% Avoidance Test
Values needed for 1% avoidance:
Agility: 20/1.15 (Sinister Calling)
Dodge: 12*82/52
Parry: 20*82/52 (no parry items used though)
Defense: 1.5*82/52/0.12 (1 point of defense is worth 0.12% avoidance through miss, dodge and parry)
Base stats:
+5% Parry
+5% Dodge
+1% Dodge (Night Elf)
+15% Agility
163 Agility as a naked level 70 Night Elf. 3.7825% additional dodge through base agility [((163*1.15)-111.8)/20]
So we're looking at
5% Parry + 5% Parry + 5% Dodge + 5% Dodge + 3.7825% Dodge + 5% Miss
- 0.6% Miss - 0.6% Dodge - 0.6% Parry (because of the boss mob)
[top] 26.9825% Avoidance
Total stats through equipment:
598 Agi
220 Dodge
186 Defense
Avoidance through equipment:
598/(20/1,15)
34.385% Dodge
220/(12*82/52)= 11.621% Dodge
186/((1.5*82/52)/0.12)= 9.43% Avoidance
= 82.42% Avoidance
+ Scroll of Agility [20 Agi]
+ Elixir of Major Agility [35 Agi]
+ Warp Burger [20 Agi]
+ Blessing of Kings [+15% Agi] (assuming that Sinister Calling and Blessing of Kings stack multiplicative)
= 93.95% Avoidance
+ Survival of the Fittest [+3% Agi] (multiplicative?)
+ Grace of Air Totem [88 Agi]
= 101.6% Avoidance
+ Insect Swarm [2% Miss]
+ Scorpid Sting [5% Miss]
= 108.6% Avoidance
So theoretically possible.
Equipment list:
Head:
[Deathblow X11 Goggles] [68 Agi] + [17 Dodge, 16 Def]
Neck:
[The Darkener's Grasp] [23 Dodge, 27 Def]
Shoulder:
[Deathmantle Shoulderpads] [50 Agi] + [15 Dodge, 10 Def]
Back:
[Phoenix-Wing Cloak] [27 Dodge, 22 Def] + [12 Agi]
Chest:
[Auchenai Monk's Tunic] [48 Agi, 30 Dodge] + [6 Agi]
Wrist:
[Insidious Bands] [30 Agi, 8 Def] + [12 Def]
Hands:
[Gloves of Dexterous Manipulation] [51 Agi] + [15 Agi]
Waist:
[Belt of Deep Shadow] [48 Agi]
Legs:
[Skulker's Greaves] [56 Agi] + [12 Agi]
Feet:
[Nimble-foot Treads] [32 Agi, 25 Dodge] + [12 Agi]
Finger: 2x
[Delicate Eternium Ring] [25 Agi, 16 Dodge] + [4 Agi]
Trinket:
[Shadowmoon Insignia] [32 Dodge, 36 Def]
+
[Scarab of Displacement] [42 Def]
Mainhand:
[Blade of Infamy] [28 Agi] + [20 Agi]
Offhand:
[The Sun Eater] [19 Dodge, 13 Def] + [20 Agi]
Randged:
[Barrel-Blade Longrifle] [32 Agi]