Possible Clues:

• Afro to be incorrect wearing no shoes
• Advantage securing a judge in contact with ground level
• Without shoes, socks
• 30 centimetres discalced?
• A football official in appropriate gear - or not
• Without socks or shoes
• Measure of toe wrestling, so conducted?
• A girl might dance like this, but a judge must wear a shoe
• Like some hippies?
• A whistle-blower has to kick around, without protection for lowest members