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Heads of state tend to dress in their best attire, based upon their culture. Zelenskyy shows up for meetings in a sweatshirt.

I would say he's in the middle of a war, but he's miles away and probably a few stops along the way. But is there a tailor where he is? Could the U.S not have offered him one?

So many possibilities, but yes he's addressing the world at a world stage.