I don't have skinny calves, AND I'm also pregnant. And these calves were still absolutely huge on me. Too huge to make it work. It's a shame, too, since the quality of this shoe is amazing. The Cognac color is really beautiful. One other thing: I am 5'10", and this boot shaft is so tall, even on me, that it was almost uncomfortable to bend at the knee to sit down. It jabs you right in the back of the knee. I can't imagine anyone under 5'10" being even vaguely comfortable in this boot.