AusFlygal
SHIRTS - I cant help you with where to buy them in VIC but dont go for the cheap ones wherever you buy them. Spend a bit more dosh and they'll last you alot longer and wont 'yellow' so quickley.
EPAULETTES - Depends. If you're doing a CPL test and still want to wear a uniform for gods sake don't wear epaulettes; you dont have the licence till its over. Otherwise the general epaulette thing at most companies is:
1 Bar - plain ol' CPL
2 Bar - CPL + instructor rating or instrument rating (depending on the company may also be the plain ol' CPL)
3 Bar - Twin flying or Grade 1
4 Bar - Someone who flys less and gets paid more than you! Generally CP or CFI.
Twin.
PS - Good luck with the test.