Dkg: Unwrap it with Blender. And ask @octagesimal / @casyopea !
Daniel tells his story building a wooly mammoth, and throws some ideas on how this could be implemented easily with free software. But if I read his post correctly, Daniel still misses the precise ways to do it.
Our friends Octavio and Claudia (twitted hereby) have given some Blender courses here at our classroom at home (Guys! Come again! We miss you!), and host the Spanish-speaking g-blender community. At one of their courses, they showed how to model an object/character, and in order to color/texture its parts, you can unwrap it — This process yields a flattened image with the surfaces that build your object, that you can then color. Well, you can also use it as a base pattern to cut and sew your plush!
It is not meant to be used for this (although it works), so it won’t give you the extra tabs to be sewn in place, and the joints might not be at the most comfortable places. But it is base you can work from.