Recent Examples on the WebThey were also found alongside buttons from a Union sack coat. Beth Mole, Ars Technica, 21 June 2018 Union sack coats similar to the one that this soldier had been buried in were in use only for the second battle. Ryan P. Smith, Smithsonian, 20 June 2018 Bies and his colleagues confirmed that these were buttons—and not just any buttons, but buttons characteristic of an official Union sack coat. Ryan P. Smith, Smithsonian, 20 June 2018