Quote Originally Posted by HyoMinPark View Post
The crafting material “Celestial Kimono Remnant” is currently available in-game, and it’s not untradeable. There’s 41 of them up for sale on the Market Board right now on Cactuar. Another poster said that it may drop into a player’s inventory a la “Fiend Sap”... which, if it does, RIP. I did SephEx almost 100 times and never got a single Fiend Sap. ;-; Haven’t gotten any of Tsuku’s crafting mat either, and haven’t seen it drop in the coffer yet.

It may not, though. Because they aren’t nearly the same price as Fiend Sap was on my server (750k for the Kimono Remnant, and Fiend Sap was always several million). Probably just a bit more rarer than Byakko’s crafting mat was.
The material drops directly into a random player's inventory at the same time as the chest is opened. I've seen it drop two or three times now and also gotten one myself.