My big quest for the fall is to find flat or low-heel, knee-high riding boots, in an equestrian style. I'm hoping all you boot experts can help me out!

I think I'd like a dark brown color, but I'm open to other ideas.

I measured my calves to hopefully make this easier: my calf circumference is 12.5 - 12.75 inches (depends on the calf), and from the floor to the base of my knee is 16.5-17 inches, depending on whether I measure to the very bottom of my knee or the base of my kneecap. What does this mean for what boot measurements I should look for? I'd like to wear the boots both with skirts/leggings and with skinny jeans tucket into them, so what boot opening measurement should I look for?

My next difficulty is that I have bunions and wear orthotics, so I'd like a pair that are compatible with orthotics. Maybe this is impossible to find off the rack, so I'm open to having the boots stretched (the Star Ling Julian boots are at the cobbler right now).

I want to get a good quality pair and keep them for a long time, so I'm willing to spend a few hundred dollars.

What do you recommend?