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Actually, Legolas was cosplay as Hobbit. (fanfic)
"What is your son wearing?" asked Lord Elrond.
"My wife said it's hobbit. Dunno. You know she can see the future as your mother-in-law does, where are your children," answer King Thranduil.

"Ah, Elladan and Elrohir just fight orc that Arwen made with her magic, a fake orc of course. Your son can join them," said Lord Elrond.