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Strangest material you've ever incorporated into a design: "A mix of paper and beef tripe, for my Bichos collection. People know I like unique materials so they bring them to me sometimes; this one came from a guy who had a crocodile farm in the Amazon and was mainly selling crocodile and fish skins. In Brazil the people cook with beef tripe, it's a very traditional dish. As a material, it's strange, but it's also so beautiful — almost like leather."