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The mid-length marigold frock that the first lady donned to her husband's final State of the Union address lit up the internet with a flutter of interest on Twitter.
But it appeared to be no longer available during the speech.
The sleeveless, fitted dress is made out of wool crepe with a slight funnel neckline and "moderate shoulder coverage." It has banded bodice and a slightly flared skirt.
The first lady accessorized the dress with rosy makeup, loop earrings and loose waves in her hair.
Representatives for Neiman Marcus and Narciso Rodriguez were not immediately available for comment.