Black organza Empire style dress, c. 1800-1810.  From the Centre de Documentació i Museu

Black organza Empire style dress, c. 1800-1810.  From the Centre de Documentació i Museu Tèxtil, Barcelona, item #11898.

This seems quite daring – sleeveless AND a see-through bodice! – but I’m assuming it was meant to be worn over something else.