Christians shoes

why is jacks father Christian Shepard seen wearing his white tennis shoes that he was buried in (in all the halluinations on the island) but in the cabin he has on a dark shirt(not the suit jacket and white shirt he wears with the white shoes) and dark shoes/boots  ?  ? Thoughts ? ? what is "real" and are both a manifastation of the smoke monster ?? There must be a reason . . .

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