I wear anywhere between 6 - 6.5.  Since this was a boot I would wear in the winter, I ordered a 6.5 so I could wear thick socks.  WAY too big.  Too big in the calf (I did not buy wide calf) and just overall too big in the foot, not just about where my toes fit in shoe. Was a little weird in the ankle, as if the shoe was meant for someone with an incredibly high arch and I don't consider myself flat footed. They are really cute, seems to be okay quality, but just did not fit right. I'm 5'4, and depending on the day between 135-140lbs. I don't feel like I have especially thin legs, pretty average by my account.