Ok, I'm going to take a stab at helping you here Betsey! Let my stupidity shine through!
Are you talking about the support stockings that the hospital's use after surgery? The toeless ones?...that run up to your knee?
If I remember right they seem to be a one size fits all sort of stocking. I have a pair here at home, that the hospital used on me after my surgery.
However, if I remember right, you are about the size of "Tinkerbell" from Peter Pan! ...so I can see where you might need a special size.
I probably missed this by a mile or so...but hopefully I will learn something out of it!