http://www.matrices.net/balaclava.asp this is the tutorial i originally went off of to make my suit head, and it has great mouth motion.
for the tail... I always draw out what I want the tail to look like on a piece of cheap cloth, much like bedsheet material. Keep in mind the diameter of the tail. if you want a 3 inch thick tail, that's approx. a 9 inch circumference. 4 inches, 12 inch circumference. and so on. The pattern that I draw on the cloth is a full profile view, so it makes half a tail. flip the pieces upside down for the other half
When you draw it, you should use half the circumference as the actual size for the pattern. On this, just draw out whatever pattern you want, LABEL IT CAREFULLY if there are multiple similar pieces, or even if there aren't. just label it carefully anyway
and when you draw on the fur, make sure you distinguish which piece is for what side. a simple line for all the right half pieces with of the label (DBIII for dark blue three, for example) should be sufficient for identifying the parts