Take a look at this sh1t:
It may be 0.1% or less to drop.
And you need 3 of them to craft Shade Runner.
People commented they have killed over 8000!!!
After 1500 Shaman Doll I got my 8 Cotton.
I recommend you guys to drop it at Sicarius 1F as mentioned above.
There’s much more monsters to kill. 
Good Luck.