Both dresses were designed by Gabriela Hearst and had embroidered flowers across her shoulders that represent each US state and territory.
On Instagram, the Uruguayan designer revealed that the dress was delivered to Jill on the eve of her husband's 100th day in office. Hearst also said the Silk Wool dress and matching mask, made in New York, were crafted "entirely of existing fabrics."
"It was originally used to fit the inauguration one," Hearst wrote alongside a photo of the dress on a mannequin. "The First Lady requested to salvage for another occasion. Double repurposed. New is not always better."
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Back in January, Hearst shared more details about the dress design on Instagram. She said the Inauguration Day garment - as well as its matching coat and mask - were inspired by the idea of unity, which "makes strength" and "is needed for the road ahead," she wrote at the time.
Hearst also said a flower representing Jill's home state of Delaware "is positioned at the heart level," with all other flowers branching out from there.
"Each flower took approximately two to four hours to embroider," she wrote. "Careful placements and color selections were carefully studied for weeks."
A post shared by Gabriela Hearst (@gabrielahearst)
"She uses wool from her family's sheep farm in Uruguay, according to her website, and Biden's look was made with fabrics the brand already had," Fernandez wrote.
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Representatives for Gabriela Hearst did not immediately respond to Insider's request for comment.
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