Judges Choice Show White is a beautiful, ready prepared, easy to apply leg whitener.
It is extremely effective for socks, just open the lid and paint the ready made paste onto the socks with a brush.
If your doing it the night before (for a more natural look), immediately after painting the socks, bandage the legs. Do this while the paste is still wet and brush out in the morning.
If you are wanting that crisp, bright look, paint the socks on the day of the show (can set with hairspray if needed).