A free pattern for you to crochet ankle socks that fit your feet!
Pattern download through ravelry is in English.
Many thanks to MrsFlowerpot for helping adjusting the pattern!

Un patron gratuit pour réaliser des chaussettes de tennis adaptées à vos pieds!
Patron disponible en français par le lien ci-dessous.

Errata in the English version :

“At this point you are halfway down the heel.
Fold the heel in three, mark the folding points, slip-stitch your way on one third of the heel’s width.
R 11 : 1 single crochet for each single crochet of the following third, 1 slip stitch on the first 2 single crochet of
the last third,
R 12 : slip stitch 2, turn, 1 single crochet for each of stitches you’ve just made on previous row, 1 slip stitch on the following 2 stitches of the first third.
R 13 : slip stitch 2, turn, 1 single crochet for each of the stitches you’ve just made on previous row, 1 slip stitch on the following 2 single crochet of the last third.”