We have this issue PLUS the added problem that DD will only wear knee socks that go either to the bottom of her knee or over the knee!! She has the skinniest little legs too that it is really hard to find socks that fit lengthwise and are tight enough width wise.
However, she is really easy to spot on the school grounds with everyone in a uniform - I only have to look for the white socked legs - really cute.
We found 1 brand, at Target, with the brown 2 lines toes, that have worked thus far this year. (we're keeping our fingers crossed)