At midcalf -- or about 11 inches up -- the Nellie measures a nice, skinny 12.75" in my size 7.5. Yea! The top is slightly bigger than advertised, at 14", but combined with the small ankle and midcalf measurements, the overall look is reasonably fitted.
Oh, and a word on sizing: I take between a 7.5 & 8 shoe and went with the 7.5 on this. Good call, as it does run just a bit roomy in the foot.
Calf slimness: *****/5
Find it at: Amazon
(wow! at or around 100 bucks as of early August '15 -- and as of early 2017, this elegant boot is pretty well represented on ebay - happy hunting!)