Stomacher and collar (probably Italian), ca. 1730.
From the Philadelphia Museum of Art.
Stomacher, ca. 1700-1720.
From the Manchester City Gallery.
A stomacher was a triangular piece worn over stays or a corset. Sometimes a stomacher was boned like a corset, often (as seen here) it was merely decorative.
Corset, stays, and stomacher, ca. 1620-1640.
From the Manchester City Gallery.