Hello Mie,
Thank you for your reply. I know quite well the Kakimoto papershop as it is where I go to buy japanese papers, and I met Kakimoto-san just yesterday. I will go back today and ask where their chiyogami come from.
Karacho factory is also famous, since a TV show recently broadcasted a documentary on this workshop. So, for sure, I will go there and maybe experience some kyo karagami making (which is so beautiful!).
Again, thank you for your help!