That left me with about an inch of space around the widest part of my leg, the same wiggle room as I had up top, with the opening of this boot measuring in at 14 inches.
At 11" around, the ankle tapers in from midcalf, but not super dramatically, so if your ankles are as knobby as mine, you'll have some extra space there.
You could easily punch an extra hole (try a tool like this one) in the top buckle strap, bringing it down to 13.5" in size 38, but you'd have a visible fold in the goring (see left) that may or may not be worth the half-inch subtraction.
Another helpful touch for rain & snow seasons is the grippy-looking textured rubber sole.
The shaft is 16" tall in my size, so this is a good pick for average to taller folks, perhaps less so for those under about 5'3" or with proportionally short legs.
Intrigued by the "Naturally Good" emblem in the packaging, I looked that up too on the website & discovered it signifies the use of "chromium-free leathers" (have to admit, I don't know much about leather + chromium); vegetable dyes; and nontoxic, water-based glues. Nice stuff.
Calf slimness: ****/5
Find it at:
As of Feb. 2016 it looks like this one is only available on the brand's own site -- but you'll find a great discount there & an action view on video, on a model's legs (albeit a bit fuller ones than mine)