From years of YLF-guided boot shopping, I know what constitutes a skinny calf. If your calf is 14 or 15 inches, you'll do great with most boots. If you're above that, you might need to find a "wide calf" variation, and if you're below that, you're in for years of fruitless shopping and will pay through the nose for a properly-fitting boot.
But when it comes to booties, I have no frame of reference. I try to see who's modeling it in the Zappos video ("Hmm, she looks like a skinny ankle girl,") and hope for the best.
It would help if I had a range in mind. So what do you think? What is the ankle equivalent of the 14-15 inch calf?