I don't know if this would work, but here's my idea:
Take some pantyhose and fill it with fiberfill. shape it into the right "tail" pattern.
Cover that with the model maker liquid latex, or pure latex if you want.
After that, it should be really flesh-like. You'll want to coat it in baby powder so it doesn't stick to itself, and maybe paint it?
Again, I have no idea if it'd work, but I think it will, as long as the liquid latex will coat the pantyhose fine.
So have a few cosplays I want to do, but no idea when/if I will get to them.
In the mean time, I started up my website for my props, cosplay, and useful stuff. Please check it out