Rosemary Olivero tied the knot in Boston last summer.

The 32-year-old pediatrician, who recently moved to Grand Rapids, Mich., walked down the aisle in a Vera Wang dress that set her back $6,700.

But Olivero managed to recoup more than half of the gown's cost pretty quickly. She sold it for $3,500 on PreOwnedWeddingDresses.com -- two months before the wedding.

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