I have no idea, from a Watsonian perspective, why the Wight would dress three of the Hobbits in white garments, but my mental picture from a Doyleist angle has always associated the regarbed Hobbits as Egyptian in influence: white-garbed in a tomb FEELS very Egyptian, even if it's probably not strictly accurate.
Certainly, the Númenóreans had some Egyptian influences, in their death-obsessed aspects and in their megalithic sculptures, so it's an on-key vibe for the barrow*, even if there's no specific reason for the Wight to take pointers from the Egyptians.
Although, thinking of how the Númenóreans (think of the sails in the incomplete Tal-Elmar story) make black into their most solemn colour, perhaps there is something oppositional about white around death. Now that I think about it, as an open-ended question (and I am too lazy to find a copy of the RotK...), what is Faramir garbed in for the pyre?
*I initially wrote "for the Barrow-downs" and had to correct myself!
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I prefer history, true or feigned.
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