5’10 here with a very long waist, I usually need a long, but I always need a mid-high waist breech. I really love the Dover Wellesley breeches. They do not come in a long, but they are pretty long as is. They hit just above my ankle, but I wouldn’t be offended if they came up a inch or so higher on my calf, so I think they are plenty long for most of us tall gals. I love where the waist hits me, I can actually tuck shirts in to my breeches! I don’t, but I COULD lol.
https://www.doversaddlery.com/dover-wellesley-kp-breech/p/X1-350403/
Added bonus- they are not super expensive!
@ZuzusPetals, they have stretch but aren’t a super “tech” fabric, they feel a bit more sturdy.
There is a Dover right down the road from my work, so these are pretty popular around here, many of my friends have and love them. I gave my mom a pair and she loves them too.