I recently bought The Wild Women book from The Thread Studio and this inspired me too make this bag even though it is nothing like anything in the book. I used the technique for felting around a resist from the book Uniquely Felt (also from The Thread Studio).
I have been having a great time with silk and wool fibres. I have quite a stash of these. I have bought them from all over with some of my favourite sites not in order of preference as I couldn't really pick a favourite.
http://ribbonsmyth.com/ - for ribbons and other stuff.
The Thread Studio.
Essential Textile Art.