I have a nephew with a size 17 foot. Yes. That isn't a typo. Size 17. My sister says it's very difficult to find socks for him. She just buys size 13's and let's him stretch them out.
Mom bought a whole bunch of sock yarn for me to make socks with. I haven't made a sock with my 72 needle cylinder, so I decided to try to make one for Big Foot.
Yarn: Knit Picks Pallet
Hem: Plain hung hem - 21 cranks
Leg: 35 rows
Foot: 99 rows
Gage: 8 sts/9 rows per inch
Toe to Heel measurement: 13 inches