In monster hunter2 what is a sinister cloth?

"Sinister Cloth" isn't a material or item found in Monster Hunter 2. It's likely you're thinking of a different item or are misremembering.

Could you please provide more context?

For example, do you remember:

* What monster you were hunting when you encountered this item?

* What you were trying to craft with it?

* Any other details about the item's appearance or function?

This will help me identify the item you're looking for.