As a general rule of thumb, price items at your Garage Sale about a third of what they would cost new. There are exceptions though. Clothes are generally very poor sellers, unless it's baby/kids clothes. But if you price adult-sized clothes cheap enough, it will sell regardless.
People are reluctant to pay a lot of money for clothes they can't try on, but will gamble if it's only $2 or so. I recommend taking some of your "nicer" clothes to second-hand stores, rather than trying to sell them at a Garage Sale.
Why not provide a dressing area? We have a garage sale each year, and we set up a couple of screens with a rug on the floor and a mirror. It works great, and people will pay fair prices for good clothes that fit.
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