Customs Declaration

According to the Australian Customs web site about what needs to be
declared and what not, "Declare all animal and plant materials or items
made from their parts"

I will be visiting Australia from abroad for the first time in
the near future. Parts of my shoes contain porcine leather,
and some of my clothes are made of natural fibers
(cotton, linen).

Does anybody know I need to declare that when entering Australia?
If yes, do I need to declare each article of clothes separately?

Thanks!