I'm a 400 armor smith, and I can make all of the exotic armor pieces.
Things you will need:
5 globs of ectoplasm per item (30 total). Ectos are gotten through breaking down rare and exotic lvl 70+ items using master or black lion salvage kits.
6 bolts of gossamer (12 gossamer scraps) per item. Obtained occasionally from breaking down high level cloth items and high level sacks.
21-23 gossamer thread per item (135 total). Purchased from crafting vendors
16 orichalcum ingots (32 ore) for a complete set of armor. Numbers per piece vary. Nodes in high level areas and rarely from breaking down high level metal items.
5 400 level crafting materials per item. The type determined by the stats you want.
Knights: Armored scale - Toughness, Power, Precision
Valkyrie: Vicious Fang - Power, Crit damage, Vitality
Clerics: Elaborate Totem - Healing Power, Power, Toughness
Rampager's: Powerful Venom Sac - Precision, Condition Damage, Power
Berserker's: Vial of Powerful Blood - Power, Precision, Critical Damage
Explorer's: Vicious Claw - Magic Find, Power, Precision
Carrion: Ancient Bone - Condition Damage, Power, Vitality