For me, if I love it, I will wear it lots - I used to go for cheap clothes, and I didn't love them and they fell apart and it ends up being wasteful. So now I have less clothes, and wear them a lot.

But thinking of actual stores...
- Myer's Miss Shop has good staples, long sleeved tshirts, singlets, tees, that sort of thing that they sell quite cheaply and I live in them because they're always under another top or accessory.
- Tree of Life, because I only buy things from there when they're on sale, and because I like that style, I get a lot of wear from those clothes (which is why it's good to buy what you love, within a reasonable price).
- I think it's JeansWest that do two pairs of jeans for $100? So I just find out when my sister needs jeans.
- I also have some surf brand stuff that I have gotten so much wear out of...I still have a pair of jeans that I bought at the very start of 2006 and I wear them heeeaps. And I got them at one of their after Christmas sales.

For kids, BigW can have some really decently priced stuff - given how fast my kids grow since they're still quite little, they don't get a chance to wear it out.