Just had a look at your pics - looks good I'm particularly taken with that shirt/jacket/unstructured /knubby (tweedy??) cardigan thing.
I think you said you are a student teacher?
Given your style and occupation you might find inspiration in the general area of IVY look. A smart look but a bit understated and not too dressed up. One of the few looks that works well as smart casual without looking either like some dork who just took his tie off for the weekend or an "individual" in sloppy jeans and athletic shoes with t shirt. Study the broad IVY look - not the TRAD old man side so much and i think you'll be rewarded.
In my short forays into Adelaide opshops and second hand stores I'd say Adelaide might be a relatively rich pickings, due to the wealthy ascendancy buying clothes overseas and offloading them at home, and almost non existent competition.
Heres a few links below. There are also some tasty books around.
http://www.etsy.com/shop/NewtonStreetVintage , http://www.etsy.com/shop/TheIvyLeagueShop ,
http://theivyleaguelook.blogspot.com.au/ , http://heavytweed.blogspot.com.au/ ,
http://anaffordablewardrobe.blogspot.com.au/ , http://www.ivy-style.com/ ,
http://thecurriculum.net/forum/viewtopic.php?f=7&t=647 , http://forums.filmnoirbuff.com/viewtopic.php?id=3361
I came across this from Adelaide and don't know anything about it:
http://thethousands.com.au/adelaide/shop/ivy-league/ , http://thethousands.com.au/adelaide/sho … gue-store/
http://www.ivy-league.com.au/ , http://www.facebook.com/pages/Ivy-Leagu … 8978358746
I hadn't heard of this shop when last in Adelaide. Not much to see on their web page, makes me wonder. The Facebook page is a bit of a mess and suggests more hipster with neo preppy tinge rather than Ivy.