Sinister Cloth is only available as a trading item from Gawdygog and Kilama. These are two traders that unlock as you progress through the Monster Hunter Wilds campaign and post-game content. There is only a chance they will have it in their inventory, so you will need to check back in regularly to see if they stock it.

One of the coolest armor sets is hidden out of sight in Monster Hunter Wilds, offering a valuable incentive for dedicated hunters who seek it out.

Monster Hunter Wilds is loaded with crucial crafting materials, and few are as elusive as the Sinister Cloth, which is important in crafting a great armour set.