Crafting

Crafting Levels
From crafting level 5 (Which is what you start at when you make a new character) up to crafting level 21, you will create " Uncommon " cloth, leather, and plate armor. From crafting level 22 up to 71, you will create " Superior " cloth, leather, and plate armor. From crafting level 72 up to the maximum of crafting level 85, you will create " Epic " cloth, leather, and plate armor. " Heroic ", " Legendary ", and " Heirloom " items are un-attainable using your crafting skill.

Note: All level 80-85 location drops level 80-85 crafting materials but some are mostly found in specific locations

Cloth Crafting
5-10 Linen Cloth [Goldshire / Trisfal Glades]

11-20 Wool Cloth [Westfall / Silverpine]

21-30 Silk Cloth [Duskwood]

31-40 Mageweave Cloth [Stranglethorn Vale]

41-50 Runecloth [Blasted Lands]

51-60 Felcloth [Burning Steppes / Western Plaguelands]

61-70 Netherweave Cloth [Netherstorm]

71-80 Frostweave Cloth [Ice Crown]

80-85 Embersilk Cloth [Mostly Found in Vashj'ir / Twilight Highlands]

86-90 Windwool Cloth [Kun Lai Summit/ Townlong Steppes/ Vale of Eternal Blossoms]

Leather Crafting
5-10 Leather Scraps [Teldrassil / Mulgore]

11-20 Light Leather [Darkshore / The Barrens]

21-30 Medium Leather [Ashenvale]

31-40 Heavy Leather [Thousand Needles]

41-50 Thick Leather [Tanaris]

51-60 Rugged Leather [ Un'Goro Crater]

61-70 Knothide Leather [Zangamarsh]

71-80 Borean Leather [Howling Fjord]

80-85 Savage Leather [Mostly Found in Uldum / Mount Hyjal]

85-90 Exotic Leather [Jade Forest]

Plate Crafting
5-10 Copper Ore [Dun Morough / Durotar]

11-20 Tin Ore [Loch Modan / The Barrens]

21-30 Iron Ore [Wetlands]

31-40 Mithril Ore [Arathi Highlands]

41-50 Truesilver Ore [Hinterlands]

51-60 Thorium Ore [Western Plaguelands]

61-70 Fel Iron Ore [Hellfire Peninsula]

71-80 Saronite Ore [Dragonblight]

80-85 Elementium Ore [Mostly Found in Deepholm]

86-90 Ghost Iron Ore [Vale of Eternal Blossoms]

Legendary Crafting
I don't know about the others. But the Stalker Armor required 1000 of Devilsaur Leather.

71-80 Fur Cloth [Ice Crown] = 85 Freezing Heart Armor : +1995 Intellect

51-60 Devilsaur Leather [Un'Goro Crater] = 85 Devilsaur Stalker Armor : +1995 Agility

51-60 Arcanite Ore [Burning Steppes] = 85 Arcanite Armor : +1995 Strength