Etiko, arguably Australia's most ethical clothing brand, has got a 25% off everything sale on at present (discount applies at checkout). Great for casual clothing staples, sneakers, thongs, etc.
Shop Ethical guide listing- https://guide.ethical.org.au/company/?company=4881
Good on You listing- https://directory.goodonyou.eco/brand/etiko
I can vouch for their thongs. They’re really comfy.