5'8 or 9" depending on who and when you measure me, and my mare is 15.2 hh sadly narrow so I look a little tall on her, but she is an awsome horse. I liked my 16 hh standardbred mare better her barrel was deep and we looked great together.
But I've ridden anything from 12 hh to 18 hh mostly 13 to 14.2 hh when I use to take lessons because I was the tallest one they didn't own to many horses any taller.
Five foot three. My horses are 14.3, 15 and 14.2 and growing.
I prefer shorter horses that I can mount, and not very stocky ones, because I have a titanium rod and plates and screws inside my left leg, and don't like to have it straddled on a fat horse, it's uncomfortable.
I'm 6'2" and my horse is only 15.2-15.3 and I have asked people if I looked silly on him and people say you look just fine. I thought my legs would look like they were dragging on the ground, but I guess they don't.