Hard to say. I spent some time poking about pages on Korean historical clothing, but they all did it the other way 'round.
The person in question isn't human, although he's more-or-less passing for one. What he is hasn't been revealed yet in the English-language versions. But I suspect the clothing might be significant somehow, although the characters never comment on it other than "old-fashioned clothing" - in this one (http://www.magatsu.net/pic/antique-03.jpg) and this one (http://www.magatsu.net/pic/antique-04.jpg), the closure is on the left side. In this one (http://www.magatsu.net/pic/antique-02.jpg) I see that the soul collector picture has the closing on the left also, so maybe it's a non-human thing? Unfortunately, googling for "korea(n) soul collector" has been utterly useless and I don't know the Korean term for it. *sigh*
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The person in question isn't human, although he's more-or-less passing for one. What he is hasn't been revealed yet in the English-language versions. But I suspect the clothing might be significant somehow, although the characters never comment on it other than "old-fashioned clothing" - in this one (http://www.magatsu.net/pic/antique-03.jpg) and this one (http://www.magatsu.net/pic/antique-04.jpg), the closure is on the left side. In this one (http://www.magatsu.net/pic/antique-02.jpg) I see that the soul collector picture has the closing on the left also, so maybe it's a non-human thing? Unfortunately, googling for "korea(n) soul collector" has been utterly useless and I don't know the Korean term for it. *sigh*