Fit is one of the most important things when you try on clothes, no matter where they are from.
Some stores i can recommend for street wear:
Sp1, Sp2 (TGV, Market City): higher end and more unique street wear, with a more international influence.
General Pants: mid range street wear. alot of things from this store will be seen worn by other people on the streets.
Glue store: a bit overpriced but some stuff is decent.
Loose threads (cabramatta, whetherill park): some brand name gear for quite cheap especially come sale time.
Urban Equipment: A more upscale streetwear store. Very expensive stuff, so maybe bring a friend or someone who can give you a good opinion before you drop $$$.
The above mentioned stores may have little to alot of stuff you may like. Be patient and you probably can get really good deals when sales are on.