*Michelle Obama had an historic fashion moment Sunday night with the sporting of her one-of-a-kind vintage number by the late designer Norman Norell.

The First Lady bought the black-lace overlay dress, which boasted a full tea-length tulle style skirt and a square neckline at New York Vintage boutique, signaling what store owner Jon Schneck believes to be the first time a first lady has worn a vintage dress to a public event, reports The Huffington Post.

“We are truly honored that the First Lady has chosen a gown from New York Vintage as her first venture into vintage couture,” says Schneck. “Other dresses from our archive have been scheduled for use by the first lady later this year.”

The dress, estimated to be worth around $2500, was accessorized with oversized snowflake drop earrings.

Obama donned the 1950s piece to the “Christmas in Washington” concert in Washington, D.C., which airs tonight on TNT at 8 p.m./7 p.m. Central and is hosted by Ellen DeGeneres.  The special features performances by Mariah Carey, Annie Lennox and more.