perfect size 6 figures

I was appalled to read reports about the revamped Sweet Valley High books - see here and here for details. Why update the books, when fashion is cyclical anyway? As the links point out, the brand names in the original series were made up, which (slightly) extended the shelf life of the books.
But I'm beyond cranky about how the Wakefield twins lost their often-mentioned "perfect size 6 figures" in the rewritten series. Now, they are size 4. Given that they're 5'6", size 4 seems underweight for them.