Might have luck withbonline stores based in the Northern hemishpere and getting something shipped. Could be easier if you’ve family somewhere up there to send the items on to you.

Bonus is, no matter where you look, they probably have a better winter range than Australia does even when winters on the way.

Also ignore my advice, i know nothing about clothing, or its industry, and shouldn’t be trusted to know the difference between a Matrix Coats and a bin bag.