Northern Cloth Scavenging is a skill learned from completing a quest or from [A Guide to Northern Cloth Scavenging] at roughly skill level 325 to 350, that allows a tailor to loot extra cloth off of Northrend mobs.
Source[]
Complete 
[??] Cloth Scavenging quest (costs 5
) from one of the following Tailoring trainers:
- Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. Charles Worth in Dalaran.
- Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. Darin Goodstitch at Valiance Keep.
- Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. Benjamin Clegg at Valgarde.
- Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. Alexandra McQueen at Vengeance Landing.
- Lua error in package.lua at line 80: module 'Module:Factiongfx/faction_tip_link.json' not found. Raenah at Warsong Hold.
Or, learn it from [A Guide to Northern Cloth Scavenging] which is random drop from a Northrend boss.