The First Lady signed copies of her book "American Grown: The Story of the White House Kitchen Garden and Gardens Across America," during a signing event at Politics & Prose in Washington, D.C. on Tuesday. For the event, Mrs. O wore a blue and gold pleated skirt paired with an embellished navy floral top.
For a detail view:
Update: Reader lisam has spotted Mrs. O's top, the Marygrace Sweater by Tory Burch, available here. The bracelets are from Alexis Bittar, part of the designer's Elements Collection.