Stomachers
I've noticed for a while that even movies with generally well-made costumes have a tendency to consider stomachers worn only with formal clothing. John Adams , for example, shows Abigail ca. 1775 in a plain gown with an anachronistic center front closure for working around the farm, but in France (ca. 1785) in a fancy silk gown with a stomacher. (One also sees this to an extent with re-enactors, helped along by older research that calls center-front closures accurate from 1770.) The perception seems to exist because it's simpler to close a gown with both bodice edges together than to incorporate an extra piece. As I am joining a re-enactment group and am preparing to make my own ensemble, I wanted to do as much research into not-completely-formal stomachers as possible to make and back up my own choices.