What are reasonable prices for different clothing items (jeans, tees, sweaters, et cetera)?

The more I browse around, the more I fear that my sense of reasonable pricing is being skewed. After you’ve looked at enough $100 dresses, $60 starts to look fairly reasonable, but is it really?

What are good baseline prices for common clothing items? For me, my ‘reasonable price’ for jeans is about $30. So above that is expensive; below that is a good deal. But what about other stuff—dress pants, casual summer dresses, that kind of thing? I’m mostly hoping you Flutherites can help me develop a sense of perspective when shopping.

If it helps: I’m in that youngish age bracket that tends to buy trendy clothing items and phase them out of outfit circulation a few years down the road. I’d like to think that the things I buy today are things I’ll still find use for in 5 or 10 years, but the fact is that at my age I’m not really buying for longevity. Oh, and I’m female.