Recommendations for second hand or sustainable shops for dresses and high heels in Sydney?

Hi all!

As title says, I’m looking for stores that are sustainable and/or second hand where I can buy more dressy garments such as going out dresses/skirts and high heels in Sydney. Preferably in the CBD, and southern eastern areas.

If anyone has any recommendations I would absolutely love to check them out!

Thank you so much🖤