A Century of Women’s Fashion. The doll on the left wears a typical everyday ensemble with a cutaway half gown. The lacing would normally thread through the lapels of the gown and secure it over her bodice.
The doll in the centers wears a formal eighteenth century or Georgian robe à la Francaise, a cutaway gown usually worn over a central petticoat and pinned to a stomacher.
The doll on the right is dressed for 1810, or the Regency period, in a high-waisted gown. The gold at her neck is a piece of foil I inserted to stabilize her loose neck joint. This doll is a Beverly Dahl creation. I don’t have the sources for the other two.