The Vestments of the Devout are turned in piece by piece through a series of quests to upgrade them to the Virtuous set.

https://vanillawowdb.com/?itemset=514 https://vanillawowdb.com/?itemset=514

The Vestments of Devout Set pieces drop from Stratholme, Scholomance, and Blackrock Spire.

Head: Drops off of Darkmaster Gandling in Scholomance
Shoulders: Drops off of Solakar in BRS (Blackrock Spire)
Chest: Drops off of General Drakkisath in BRS
Wrists: Drops off of various mobs in Stratholme
Hands: Drops off of Archivist Galford
Waist: Drops off of various mobs in BRS
Legs: Drops off of Baron Rivendare in Stratholme (Undead side)
Feet: Drops off of Maleki the Pallid in Stratholme

Also, the Belt, Bracers, and Gloves are Bind on Equip, whereas everything else is Bind on Pickup.
I hope this helps.

~Jerotin

This is the Priest Dungeon 1 set, collected in 60th instances pre-tbc. They are used to upgrade to Dungeon 2, and the other sets are:

https://vanillawowdb.com/?itemset=181 Magister's Regalia - Mage (Cloth)
https://vanillawowdb.com/?itemset=182 Vestments of the Devout - Priest (Cloth)
https://vanillawowdb.com/?itemset=183 Dreadmist Raiment - Warlock (Cloth)
https://vanillawowdb.com/?itemset=184 Shadowcraft Armor - Rogue (Leather)
https://vanillawowdb.com/?itemset=185 Wildheart Raiment - Druid (Leather)
https://vanillawowdb.com/?itemset=186 Beaststalker Armor - Hunter (Mail)
https://vanillawowdb.com/?itemset=187 The Elements - Shaman (Mail)
https://vanillawowdb.com/?itemset=188 Lightforge Armor - Paladin (Plate)
https://vanillawowdb.com/?itemset=189 Battlegear of Valor - Warrior (Plate)

REMEMBER: These don't have class restrictions. You can use any that you can, but the stats are tuned to the particular classes. You also require your class's set before upgrading to Dungeon 2.

I'm a little ninja short and stout
I take all the epics and hearthstone out
All the people on vent scream and shout
Cause I'm a little rogue in full devout

<b>Horde Upgrade Chain</b>

1. https://vanillawowdb.com/?quest=8916"">An Earnest Proposition <ul><li><div>15x https://vanillawowdb.com/?item=22381"">Silithus Venom Sample (dropped by spiders and scorpions in https://vanillawowdb.com/?maps=1377"">Silithus )</div></li><li><div>https://vanillawowdb.com/?item=16697"">Devout Bracers (dropped by thrash mobs in https://vanillawowdb.com/?maps=2017"">Stratholme )</div></li><li><div>20 Gold</div></li></ul>2. https://vanillawowdb.com/?quest=8923"">A Supernatural Device
3. https://vanillawowdb.com/?quest=8921"">The Ectoplasmic Distiller <ul><li><div>https://vanillawowdb.com/?item=16006"">Delicate Arcanite Converter (crafted by engineers)</div></li><li><div>4x https://vanillawowdb.com/?item=16203"">Greater Eternal Essence (disenchanted from ilvl 56-65 greens)</div></li><li><div>10x https://vanillawowdb.com/?item=13423"">Stonescale Oil (crafted by alchemists)</div></li><li><div>25x https://vanillawowdb.com/?item=22338"">Volcanic Ash (found in https://vanillawowdb.com/?maps=46"">Burning Steppes in https://vanillawowdb.com/?object=181098"">Volcaninc Ash )</div></li><li><div>40 Gold</div></li></ul>4. https://vanillawowdb.com/?quest=8924"">Hunting for Ectoplasm <ul><li><div>12x https://vanillawowdb.com/?item=21937"">Scorched Ectoplasm (dropped by undead night elfs in https://vanillawowdb.com/?maps=1377"">Silithus )</div></li><li><div>12x https://vanillawowdb.com/?item=21936"">Frozen Ectoplasm (dropped by undead highborne in the https://vanillawowdb.com/?maps=618"">Winterspring )</div></li><li><div>12x https://vanillawowdb.com/?item=21935"">Stable Ectoplasm (dropped by various banshees and shades in https://vanillawowdb.com/?maps=139"">Eastern Plaguelands )</div></li></ul>5. https://vanillawowdb.com/?quest=8925"">A Portable Power Source <ul><li><div>https://vanillawowdb.com/?item=21938"">Magma Core (dropped by https://vanillawowdb.com/?npc=16043"">Magma Lord Bokk in https://vanillawowdb.com/?maps=46"">Burning Steppes )</div></li></ul>6. https://vanillawowdb.com/?quest=8928"">A Shifty Merchant <ul><li><div>https://vanillawowdb.com/?item=21939"">Fel Elemental Rod (sold by https://vanillawowdb.com/?npc=16015"">Vi'el in https://vanillawowdb.com/?maps=618"">Winterspring for 40 Gold)</div></li></ul>7. https://vanillawowdb.com/?quest=8978"">Return to Mokvar
8. https://vanillawowdb.com/?quest=8940"">Just Compensation <ul><li><div>https://vanillawowdb.com/?item=16696"">Devout Belt (dropped by thrash mobs in https://vanillawowdb.com/?maps=1583"">Blackrock Spire )</div></li><li><div>https://vanillawowdb.com/?item=16692"">Devout Gloves (dropped by https://vanillawowdb.com/?npc=10811"">Archivist Galford in https://vanillawowdb.com/?maps=2017"">Stratholme )</div></li></ul>9. https://vanillawowdb.com/?quest=8930"">In Search of Anthion
10. https://vanillawowdb.com/?quest=8945"">Dead Man's Plea
11. https://vanillawowdb.com/?quest=8946"">Proof of Life
12. https://vanillawowdb.com/?quest=8947"">Anthion's Strange Request <ul><li><div>3x https://vanillawowdb.com/?item=11371"">Dark Iron Bar (crafted by miners in https://vanillawowdb.com/?maps=1584"">Blackrock Depths )</div></li><li><div>20x https://vanillawowdb.com/?item=12810"">Enchanted Leather (crafted by enchanters)</div></li><li><div>3x https://vanillawowdb.com/?item=14342"">Mooncloth (crafted by tailors in a moonwell)</div></li><li><div>4x https://vanillawowdb.com/?item=15407"">Cured Rugged Hide (crafted by leatherworkers)</div></li></ul>13. https://vanillawowdb.com/?quest=8948"">Anthion's Old Friend
14. https://vanillawowdb.com/?quest=8949"">Falrin's Vendetta <ul><li><div>25x https://vanillawowdb.com/?item=21982"">Ogre Warbeads (dropped by ogres in https://vanillawowdb.com/?maps=2557"">Dire Maul , https://vanillawowdb.com/?maps=357"">Feralas and https://vanillawowdb.com/?maps=1583"">Lower Blackrock Spire )</div></li></ul>15. https://vanillawowdb.com/?quest=8950"">The Instigator's Enchantment <ul><li><div>https://vanillawowdb.com/?item=22224"">Jeering Spectre's Essence (dropped by undead mobs in https://vanillawowdb.com/?maps=2557"">Dire Maul West )</div></li><li><div>4x https://vanillawowdb.com/?item=20520"">Dark Rune (dropped by mobs in https://vanillawowdb.com/?maps=2057"">Scholomance )</div></li><li><div>8x https://vanillawowdb.com/?item=14344"">Large Brilliant Shard (disenchanted from ilvl 56-65 blues)</div></li></ul>16. https://vanillawowdb.com/?quest=9015"">The Challenge
17. https://vanillawowdb.com/?quest=9019"">Anthion's Parting Words <ul><li><div>https://vanillawowdb.com/?item=16691"">Devout Sandals (dropped by https://vanillawowdb.com/?npc=10438"">Maleki the Pallid in https://vanillawowdb.com/?maps=2017"">Stratholme )</div></li><li><div>https://vanillawowdb.com/?item=16694"">Devout Skirt (dropped by https://vanillawowdb.com/?npc=10440"">Baron Rivendare in https://vanillawowdb.com/?maps=2017"">Stratholme )</div></li><li><div>https://vanillawowdb.com/?item=16695"">Devout Mantle (dropped by https://vanillawowdb.com/?npc=10264"">Solakar Flamewreath in https://vanillawowdb.com/?maps=1583"">Upper Blackrock Spire )</div></li></ul>18. https://vanillawowdb.com/?quest=9032"">Bodley's Unfortunate Fate
19. https://vanillawowdb.com/?quest=8961"">Three Kings of Flame <ul><li><div>https://vanillawowdb.com/?item=21987"">Incendicite of Incendius (dropped by https://vanillawowdb.com/?npc=9017"">Lord Incendius in https://vanillawowdb.com/?maps=1584"">Blackrock Depths )</div></li><li><div>https://vanillawowdb.com/?item=21988"">Ember of Emberseer (dropped by https://vanillawowdb.com/?npc=9816"">Pyroguard Emberseer in https://vanillawowdb.com/?maps=1583"">Upper Blackrock Spire )</div></li><li><div>https://vanillawowdb.com/?item=21989"">Cinder of Cynders (dropped by https://vanillawowdb.com/?npc=15206"">The Duke of Cynders in https://vanillawowdb.com/?maps=1377"">Silithus )</div></li><li><div>https://vanillawowdb.com/?item=22014"">Hallowed Brazier (sold by Argent Dawn quartermasters in https://vanillawowdb.com/?maps=85"">Tirisfal Glades , https://vanillawowdb.com/?maps=28"">Western Plaguelands and https://vanillawowdb.com/?maps=139"">Eastern Plaguelads for 120 Gold at Honored standing)</div></li></ul>20. https://vanillawowdb.com/?quest=8962"">Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22226"">Druidical Remains (drops in https://vanillawowdb.com/?maps=1377"">Hive'Regal )</div></li></ul>21. https://vanillawowdb.com/?quest=8966"">The Left Piece of Lord Valthalak's Amulet

or

20. https://vanillawowdb.com/?quest=8963"">Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22227"">Starbreeze Village Relic (dropped by giants in https://vanillawowdb.com/?maps=618"">Winterspring )</div></li></ul>21. https://vanillawowdb.com/?quest=8967"">The Left Piece of Lord Valthalak's Amulet

or

20. https://vanillawowdb.com/?quest=8964"">Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22228"">Brilliant Sword of Zealotry (dropped by https://vanillawowdb.com/?npc=9448"">Scarlet Praetorians at https://vanillawowdb.com/?maps=139"">Tyr's Hand )</div></li></ul>21. https://vanillawowdb.com/?quest=8968"">The Left Piece of Lord Valthalak's Amulet

or

20. https://vanillawowdb.com/?quest=8965"">Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22229"">Soul Ashes of the Banished (drops at https://vanillawowdb.com/?maps=267"">Purgation Isle )</div></li></ul>21. https://vanillawowdb.com/?quest=8969"">The Left Piece of Lord Valthalak's Amulet

22. https://vanillawowdb.com/?quest=8970"">I See Alcaz Island In Your Future... <ul><li><div>20x https://vanillawowdb.com/?item=22094"">Bloodkelp (dropped by elite naga at https://vanillawowdb.com/?maps=15"">Alcaz Island )</div></li></ul>23. https://vanillawowdb.com/?quest=8986"">More Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22226"">Druidical Remains (drops in https://vanillawowdb.com/?maps=1377"">Hive'Regal )</div></li></ul>24. https://vanillawowdb.com/?quest=8989"">The Right Piece of Lord Valthalak's Amulet

or

23. https://vanillawowdb.com/?quest=8985"">More Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22227"">Starbreeze Village Relic (dropped by giants in https://vanillawowdb.com/?maps=618"">Winterspring )</div></li></ul>24. https://vanillawowdb.com/?quest=8990"">The Right Piece of Lord Valthalak's Amulet

or

23. https://vanillawowdb.com/?quest=8987"">More Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22228"">Brilliant Sword of Zealotry (dropped by https://vanillawowdb.com/?npc=9448"">Scarlet Praetorians at https://vanillawowdb.com/?maps=139"">Tyr's Hand )</div></li></ul>24. https://vanillawowdb.com/?quest=8991"">The Right Piece of Lord Valthalak's Amulet

or

23. https://vanillawowdb.com/?quest=8988"">More Components of Importance <ul><li><div>https://vanillawowdb.com/?item=22229"">Soul Ashes of the Banished (drops at https://vanillawowdb.com/?maps=267"">Purgation Isle )</div></li></ul>24. https://vanillawowdb.com/?quest=8992"">The Right Piece of Lord Valthalak's Amulet

25. https://vanillawowdb.com/?quest=8994"">Final Preparations <ul><li><div>40x https://vanillawowdb.com/?item=22138"">Blackrock Bracer (dropped by mobs in https://vanillawowdb.com/?maps=1583"">Blackrock Spire )</div></li><li><div>https://vanillawowdb.com/?item=13512"">Flask of Supreme Power (crafted by alchemists)</div></li></ul>26. https://vanillawowdb.com/?quest=8995"">Mea Culpa, Lord Valthalak
27. https://vanillawowdb.com/?quest=8996"">Return to Bodley
28. https://vanillawowdb.com/?quest=8998"">Back to the Beginning
29. https://vanillawowdb.com/?quest=9009"">Saving the Best for Last <ul><li><div>https://vanillawowdb.com/?item=16693"">Devout Crown (dropped by https://vanillawowdb.com/?npc=1853"">Darkmaster Gandling in https://vanillawowdb.com/?maps=2057"">Scholomance )</div></li><li><div>https://vanillawowdb.com/?item=16690"">Devout Robe (dropped by https://vanillawowdb.com/?npc=10363"">General Drakkisath in https://vanillawowdb.com/?maps=1583"">Upper Blackrock Spire )</div></li></ul>

As of patch 4.0.3a they have removed D1 gear from the loot tables, and made it impossible to continue the D2 quest line.