I read this with interest recently in Andrew's book - applies perfectly to Tassie conditions:
Raining and 35oF is the most challenging combination of conditions that most backpackers ever experience. Eric Larson, a polar explorer also based in Boulder, Colorado, once told me that 35oF and raining is even worse than -50oF. I’m disappointed to report that I have not yet found an effective system for dealing with such conditions…
Now i have come to the same conclusion from my own experiences - though never would have put it as strongly as this!
Question is, do any of the hardened Tassie adventurers here have any hard-won advice or tips for the famous walker?