I just got my Kamik Jennifer boots today. For reference I am 5.5 tall, 120lbs, calf size 14.5 in the widest part, shoe size 7.5. I ordered an 8 in red color. Here are the measurements of the boot itself- boot shaft height: 15 inches, heel height: 1.23 inches, shaft circumference at the very top: 15.9 inches, shaft circumference 3.5 inches from the top- where your widest part of the calf would be:15.5 inches.
The fit: the fit for me is perfect, I am wearing thick nylon leggings in the pictures to show that there would be no room for any type of jeans tucked in, but leggings or pantyhose (even thick ones would be fine). I do not experience any type of discomfort while putting them on (7.5 foot) or any type of tightness in the calf- they fit really well with leggings but there is absolutely no room for anything else. So if your calf is larger than mine you may have difficulty even walking comfortably.
Quality: these boots are very well made, the rubber is pliable, they are lightweight, and the rubber is reinforced from the inside by thin threads and a lining, they also have an orthosole.
This is not a junk boot from China, the rubber is made in Italy the boot itself in Canada, and Kamik has been around for 120 years. You will get a quality product for $45 bucks!!!! Deal!