Classic Over-the-Knee Softball Socks

I'm not sure about the sizing. I got the xs/s And it was a little tight in the Calves but that for me is expected. What was not expected was that despite the fact that I got that size, they were still too big on the feet. The patch that's supposed to go over the heel sits over my ankle. I do have small feet but I didn't expect it to be that much bigger on me.