Here are 2 pairs of tall socks that appered in 2020...
But where? They are probably mid-calf-length (so not knee-highs) adult size socks. The first pair is black, with impatient/toe tap pixel Sonic at the top, while the rest except the foot area has a pattern of scattered chili-dogs. The other pair is a middle-blue color with scattered rings, and pixel-Tails who is in his flying pose at the top. Having the character art at the top of the sock is the best design decision, because that way it is always seen. Putting it on the foot guarentees it's always hidden in a shoe.
You can write in for credit if you know where these are sold.