1700s Underpinnings. Corset and Pannier, American.
Corset: From the French term for a body (corps) and the term was first used in France in the 1770s (though there had been an earlier Medieval/Renaissance usage of corset which described a decorative sleeveless bodice). In 1777 a corset was described (in French) as “a little pair of stays usually made of quilted linen without bones that ladies fasten in front with strings or ribbon and that they wear in deshabille.”
Panniers: Side hoops worn in 17th and 18th centuries to extend width of skirts at the side while leaving the front and back relatively flat. This provided a panel where woven patterns, elaborate decorations and rich embroidery could be displayed and fully appreciated.
via Louisiana Art and Science Museum.