Do such things exist? After school uniform knee length socks for girls in either grey ideally or white (won't stay white for more than a week) with a different colour or shade heel. DD2 struggles to get her socks on the right way around and it's the biggest help for her to do this - on weekends and holidays it's fine because I just selectively pick socks that tend to have a contrast heel, but it's a pain in the backside where school uniform is concerned.
Has anyone seen such a thing?