At FIVE foot SEVEN? Honestly? You're either pulling my leg or you don't know women's sizes. Or you date women with eating disorders or women who lie about their clothing sizes. My friend's wife is a size 2 and she's less than 5'2".
Size 0 is a fairly recent size (in terms of availability) meant to allow pre-teens to shop at Gap, Limited, and the like. Go to the Gap, hold up a pair of size 0 jeans. It's a child's size. It's actually the same waist size as a girl's (as in little children) size 8/medium. Girls' sizes run to 16, so that is SMALL.
I can't imagine that many non-petite full-grown healthy women can fit into that size. I have a very thin friend who is 5'4" (floats between 105-110 lbs.) and she wears as low as 1/2 and as high as 4. She would be at death's door in a 0.