Half chap size?

I was looking to buy some Saxon Equileather Half Chaps, but I wasn't sure what size to get because when I measure I got some funky measurements.

For my calf height from floor to bottom of thigh, it was a hair under 18 inches. For the width, around the widest part of my calf, it was 12 inches. I couldn't find any sizes on the chap chart with these kind of measurements. What size should I get?

12x18 is not really funky if you're super skinny and long legged. One of my kids is 12x18 and a friend of mine is 12x19! The only chaps they've been able to find are ariats (concords I thibk?) or prochaps, which maybe aren't on the market anymore... I can't find them anywhere..:( all other brands were too short or too wide.
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Actually, yes, I am skinny and leggy :)
I'll have to look around and see what I can find, thanks!

I have the saxon equileather half chaps and they've worked pretty darn good for the almost 4 months i've had them now.