Here in the midwest I generally see:
T-shirts .50 - $1. Pants, shorts, shirts, skirts $1-2. Cotton dresses, sweaters $2. Holiday dresses $2-5. Outfits $2-3. Lightweight jackets $2-3. Coats $3-5. That is provided there are no stains, rips or missing buttons. Shoes in really good conditon probably $1 a pair, maybe $2-3 if they are Stride-Rite or a similar brand.
For the stuff that isn't in good condition, 25 cents, even shoes.
I'm having a sale this weekend and I am putting all of my in-great-condition kids clothes at $1 each except for a couple of holiday dresses and a few pairs of brand new, never worn shoes. I want to make a few bucks but don't want to bring the stuff back in the house and I don't want to deal with craigslist people or having to haul it up to Goodwill.