Early 19th century. These three articles, also known as stiffeners, would have been worn around 1820-1850 by gentlemen under their high cravats and neckties, and would have supported the folds of the cravat.
The top one is made from cream woollen moiré, a kind of wool processed to resemble watered silk, and has a maker's stamp on the reverse. The middle one is dark brown natural linen, quilted and corded, and stiffened with fine reeds. The bottom one is a kind of beige
silk-cotton poplin, bordered and stiffened with white braid.
(From the Milford-Cottam collection)