Ideally I'd experience the "girlish" body without any under-age appearance. I like lithe, thin, supple women, but not overly-muscular women. And I like big Doe-eyes (a la Audrey Hepburn) with a "sweet" rather than "exotic" or "sultry" overall appearance. Girl-next-door, I guess.
So, I guess, ideally, all women in my ken would look like that. :)
In fact (as per the title of the thread), "in a (more) perfect world" there would be FEWER FATTIES and other forms of undesirables at any given club that I visit. So it might not so much be a matter of improving upon near-perfection among the girls I already DO prefer; as, correcting near-disasters among the girls I currently DON'T prefer. :)