She’s come undone (on purpose)

If you see a young person strolling down the street, pants undone, it’s probably not an “examine your zipper” situation.

Once the provenance of your uncle after Thanksgiving dinner or a practical adaptation to a pregnant belly, sporting unbuttoned jeans has become a fashion statement.

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Katie Pettit, 20, a model from Orlando, Florida, was visiting New York this month for her…