Shopping in Brisbane?

Hi there! I'm going to Brisbane, Australia over the Christmas and New Year period to visit the in-laws. As I'm leaving from the UK, I actually find myself with NO summer-type clothes!! Long story short, I've lost loads of weight and none of my old summer clothes fit anymore. In a previous life, I was a really huge Billabong/Roxy/Hurley/Quicksilver/etc fan (a lot of my summer clothes are those labels but too big to fit now). I've searched on all of these websites to find stockists in Brisbane so I could buy some things while I'm there, and I can't seem to find anything! They're all based in Sydney??!! How can that be?! I only got 1 result for a Factory Outlet by Brisbane Airport, which is an hour away from where we're going to be staying (my 65+ year old in-laws who don't believe in spending money aren't going to drive me an hour away just to buy expensive brands! haha!) Is there nothing in Brisbane city??! Any Brizzy natives out who can help advise? MANY THANKS!!