How do you measure for height in half-chaps?

Seriously needing a new pair of half-chaps and don’t know where to take the measurement for height. HELP!!!

I go on the inside of the leg from the bottom of my arch to the bottom of my knee but some go from bottom of heel to back of knee. Better a bit too long then too short, they do drop.

Unless you are measuring for custom, the sizing on the OTC brands isn’t necessarily dead on, more like ballpark. Might want to try on some that should meet your mearsurement at a brick and mortar store to see how each brand size fits. Be aware some brands are made to metric measure and somebody converts it to inches…maybe just measure in metric to get the best estimation.