Congratulations! Unfortunately I'm no help here...
That would depends.
My wife hate when she wears something tight, so in her case, I would go for the largest size in the measurement. Trick is it would probably be loose somewhere, even really loose if the different fitting measurements is more than one size away. So it would not be beautiful. Bother, the only way to go, is custom fit.
If that’s not you case, and if the sizes are not more than 1 size away, I would go for the smaller one for a better looking result.
And if the measurements are more than one size away and you are not willing to go custom fit, then, I would poke around the middle size or the feet size. Because a tight fitting sock/feet would not be great a feeling (the constant pressure on the toes) and might be reluctant.
Finally, but that’s my opinion, I hate having a slippery sock. If you use a silicon dressing aid, I would pay extra care not using it for the feet, or very little. Also, dressing aid on the other side of the latex’ d feet while mess everywhere on your floor. I would prefer talcum or better, chlorinated 😋 .
Ah, thanks for heads-up! Newbie to this forums and not searching good enough...