I'm about the same size as you, maybe an inch taller. I have a few pair of boot cut VS yoga pants. I got size XS regular length. They fit really well and the length isn't way too long, but the next time I buy some I will consider the short length. When I pull them out taught at the bottom they go about two inches past my foot. I think regular would be fine, I kind of like them longer, but I would recommend the short length.
they have a size chart on their website! you should check that out (:
get XXXXXXXXL, so when you get pregnant, they'll fit perfectly over your baby bump. even better, you can put your baby in your pants after you give birth!
Get real big ones. Your bound to fit them one day.