Fair Isle patterned knitwear developed as early as the early 19th century in fishermen's caps and jumpers. Traditional fair isle patterns use variations of OXO designs and no more than two colours of thread in each row. Colours are based on natural wool and dye colours, usually 'Shetland black' (natural dark brown), natural white, indigo blue, madder red, and plant-dye yellow. The highly-patterned knitwear became known world wide after the Prince of Wales wore a jumper while playing golf at St. Andrews in 1922. It continues to influence and inspire fashion designers and high street clothing today.