Actually if he's wearing a cloak he probably needs it his armor may be damaged or something may be hunting him
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Maybe he likes wearing the damn thing! If chief wants to wear a robe who are we to say no?!
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Well considering he's walking though the dessert and that something you would were in the dessert it kind of implies functionality.
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It might get really hot wearing a dark green suit in the dessert, the cape may keep him cool.
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Oh logic why do you rain on my parade....