It is very strange.

Undies (except the bamboo midis) must be bought one size up minimum. Usually I go to Big W for those.

Shoes are so long and narrow they must be bought a size up minimum, yet are still extremely long and narrow on feet that are naturally that way. Normal feet would require two sizes up just for the width.

Pants must be a size bigger than shirts even though my shoulders are wider than my hips (so it should be the other way around).

Tshirts are basically different sizes despite the tag.

Bras with the same tag are functionally completely different band and cup sizes.

And the trackie daks of the same size vary from small and very straight cut to running very large and exaggeratedly hourglass cut.

I unfortunately don’t have frequent opportunities to go in person otherwise I would. You really need to.