For me it's about looking understated and crisp. So...
Quality clothes in natural fabrics that fit you well (don't need to necessarily spend a fortune, just shop wisely).
Everything clean, ironed, and in a good state of repair.
No obvious and unnatural looking hair dye, make-up, fake tan e.t.c.
Just one or two pieces of good jewellery, as opposed to many pieces of bling or costume.
It's about good taste and good grooming I think. Any woman can stick to the guidelines above and look, not necessarily stinking rich, but chic, smart, and "classy" for want of a better word.
I also think personally that you can get away with things such as having less than perfect teeth if you look like you take decent care of yourself and you dress well.
On the other hand we all know of women who have pots of money and majorly lucked out in the genetic lottery but still manage to look dreadful. I don't mean to sound unsisterly but... Tulisa. Awful. Just awful. I honestly don't know how she does it. She could make vintage Chanel look like Primark seconds. I can hardly bear to look at her at times. And she's gorgeous as well!