mugwump wroteAlthough I have no knowledge about cotton and its blending with bamboo, will tell you about where you may learn about it.
The town of Bone is not that far from Ubud. It is actually close by the road to Gianyar and any driver in Ubud can take you there as it is the main source of the construction and sale of bamboo made into many different things...........even possible in assemblage with cotton.
Good Luck!
That's not far from where I stay so I'll definitely pay them a visit. Thanks!