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Okay, now I know this question is a little silly, BUT could I actually change the character's clothes after finishing the game's story?
P.S. Iv'e noticed, that the game menu's picture in the bottom left changes depending on the outfit you wear.

no, there is no such option like changing cloths or acessories.
so dont waste your time finding it out

Though your clothes are changed through different missions, such as when you are helping the Native Americans they give the same type of clothing they have.