Chani Kynes (played by Zendaya) is a Fremen from the planet of Arrakis in the sci-fi movie Dune.  Chani's people have lost their lands to colonizers in search of spice melenge, and she appears in visions had by Paul Atreides long before they meet.  Chani's primary attire consists of a stillsuit, designed to help a person survive the difficult climate of Arrakis by recycling sweat and tears into drinking water.  You can make your own stillsuit using padded tactical pants and gloves, as well as a motorcycle or paintball jacket.  Your scarf can help strategically cover the parts of the jacket that don't match the original as well.  In Paul's visions, Chani often wears a long white robe or dress.  One of the Fremen's defining features are their bright blue eyes, a side effect of long-term exposure to spice.  If you plan to wear blue contacts as part of your costume, it's best to have yourself fitted by an eye doctor to make sure you have the right size and they don't cause any damage.

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