Ferragamo is well known for his innoavtive use of unusual materials or skins.
His use of cellophane came about, like many of his other ideas, due to shortages during the 'autarchy' of the late 30s and 40s.
The Ferragamo website tells us that he came up with the idea of using cellophane when he bought his mother a box of chocolates and unwrapped one.
Early designs used weaving and crochet in the same way the raffia shoes were made, indeed the same poeple made them.
Later the cellophane was used in conjunction with a linen or cotton string and merely glued down. The designs continued to be successful until the 60s when more new materials became fashionable.