Cloth

Humanoid enemies drop cloth (50% a kill, more from rare elites); some is woven by Tailoring.
ItemWhere to find itUsed by
ArcthreadTailoringTailoring 5
Bolt of CloudsilkTailoringTailoring 22
Bolt of LinenMerchant
Tailoring
Leatherworking 1, Tailoring 6, Scribing 2
CloudsilkVictory chests: The Rimeheart, The Burning Breach, The Last Shadow, The Last Lanterns, Wings of Ruin, The Drowned Fane, Gearhollow Foundry, Vorthax, the Lodestar, The Riven King, Vaelith, the Hourkeeper, Oblivar, Herald of the Sleeper; Humanoid enemies level 6 and upLeatherworking 7, Tailoring 28
Felt ClothVictory chests: Warden of Cinders, The Risen Field, Hounds of the Storm, The Gravecaller, The Rime Huntress, The Siege Yard, Stormcrown Spire, The Mirror Court, Bleakbarrow Crypt, The Hollow HierophantTailoring 40
Linen ClothVictory chests: The Restless Dead, The Firing Line, The Bone Choir, The Briar Witch; Humanoid enemies below level 6; Salvaging gearTailoring 39, Alchemy 1
Moonsilk ThreadTailoringTailoring 5
MoonweaveTailoringTailoring 5, Scribing 5
Spider SilkVictory chests: The Silk Hollow, Webspinner Hollow; Dropped by: Webspinner, Hollow Hatchling, Spiderling, Hollow Webspinner, Webspinner Matriarch, Gloomweaver, Fen Creeper, Old BroodTailoring 18
ThreadSalvaging gear; MerchantLeatherworking 26, Tailoring 54
Wool ClothVictory chests: The Ashen Duelist, The Ossuary Gate, Frost and Fire, The Warden's Vanguard, Webspinner Hollow; Salvaging gear; MerchantTailoring 43

The number after a profession is how many of its recipes use it. All trade goods: Trade Goods.