polkadotelephant5 wrote:
I'm 5'6" 120-125lbs with low body fat and I'm a size 0-2. At 20lbs heavier I was a size 4.

This site has pics of real women based on height and weight: http://www.mybodygallery.com/
Weird. I'm 5'6" 117 pounds and I've never been able to fit anything smaller than a size 4.