This shows one way of providing a modesty piece that peeks out above the neckline of a bodice and presentable under-garments wherever a bodice or sleeves have openings.
Corset cover, American or European
Corset, French
Portrait young woman 1900 hi-res stock photography and images
Fashion – 5-Minute History
Corset 1906 The Metropolitan Museum of Art
Modern search results
Fashion – 5-Minute History
Fashion - Flipbook by Maia Torres
Corset cover, American or European