As for fleece, I'd imagine you would have to declare it as it is most likely considered to be an agricultural product. Given that a fleece that has not been processed could harbour all manner of critters, I wouldn't be surprised if you would not be able to bring it into the country at all.
Declare all food, plant and animal goods, equipment used with animals, biological materials, soils and sand to Quarantine on arrival. If you don’t, you could be given an on-the-spot fine or face prosecution
I don't know about Australia, but I believe that here in New Zealand no unprocessed wool products from Britain, and probably from everywhere else, are allowed into the country.