Silk

Silk is a Tier 5 Cloth-type material for developing armor at Chokufunsha.

Locations
Silk can be found on Floor 2+ on the Tower of Barbs.

Cloth Materials are unique in that Tier isnt directly tied to where it can be found like other materials. Other cloth materials can be found in its place and vice-versa in most cases.

Silk can also be bought at any Gyaku-Funsha for 2,000 KC.

12F Ukongaoka easy path for KC and cloth. Farming path video: https://www.youtube.com/watch?v=FDm_hDJ9R1Y

Uses
NOTE: Tier is a level of power typically based on the number of times equipment has changed forms, not the number of stars it has.