The cardigan she was wearing was from her time on Blue Peter.
The new item will make use of 68,000 bottles a year.
Kate Middleton's Sustainable Fashion Game is Strong on BAFTA Red Carpet
Fast fashion retailers have come under fire over the past couple of years.
The running shoe has been three years in development and are made from castor bean oil, eucalyptus tree, algae, and natural rubber,
Women have been calling out for eco-friendly alternatives.