I learned to make this doll with Vanja Grundmann and there is a complete photo tutorial in her blog AmigurumiBB:

http://amigurumibb.com/2015/09/03/one-piece-doll-2/

This is my interpretation about her pattern. Any question please send me a message here or in my blog

http://teiadecarinhos.blogspot.com.br/

I’ll be happy to help.