One of my friends in college was one of thirteen - I forget what the boy/girl breakdown was, but he said that for the boys, his mom would buy identical 6-packs of tube socks, and all the blue-with-red-stripes belonged to boy 1, yellow-witth-blue to boy 2, etc. I’d have gone with all white myself.
I tried to do that too. All three wanted tube socks but I could always tell who belonged to the ones with holes all over the bottom!