I saw this search term so I wanted to throw this out there.
In the winter, we liked the thicker Falls Creek brand white crew socks, but Drake is pretty skinny and they may not work for other kids if the ankle/shin part of the brace is tighter. I found these at Meijer. With crew socks, I always tried to avoid really big ridges. These would leave marks on his legs due to the necessity of strapping the shoes on as tight as possible, and when we did try this kind once it made him fussier in the brace, also.
In summer/not cold, the triple roll socks you can find in the toddler/baby section at Old Navy or Gap. Every once in a while, they have a sale of 5 for $1 or $1.50. I would stock up when I had coupons, reward cash, or these sales would occur.
Any socks that aren’t too tight on the shin with big ridges and that are tall enough to reach the bottom of the knee or top of the brace should work. We always stuck with white for easier matching and they seemed to make his foot sweat less.
We would wipe the brace out with rubbing alcohol in the morning once a week, and never had an issue with athlete’s foot or anything.
I would advise to be careful how tight you pull socks down on the toe though. Usually when he would get fussy, it would be because the sock was bothering him touching his big toe.