stomacher

liivi, miehusta puhekieltä A type of men's waistcoat. (defdate)
puhekieltä An ornamental cloth, often embellished with embroidery or jewelry, worn over the chest by women beneath their bodices or by men and women as the central part of an open shirt, blouse, or jacket.
1611, The Bible, Authorized (King James) Version, Isaiah 3.24:

And it shall come to pass, that instead of sweet smell there shall be stink; and instead of a girdle a rent; and instead of well set hair baldness; and instead of a stomacher (transterm) a girding of sackcloth; and burning instead of beauty.

Stomacher brooch of brilliants and fine oriental pearls.

She is a fine old lady, handsome, stately, wonderfully neat, and has such a back and such a stomacher that if her stays should turn out when she dies to have been a broad old-fashioned family fire-grate, nobody who knows her would have cause to be surprised.

Here, from the fading canvas, smiled Lady Elizabeth Devereux, in her gauze hood, pearl stomacher, and pink slashed sleeves.

From about 1850 onwards jewellery varied between these outsize sprays, stomachers and corsage montages and smaller, more delicate pieces which appeared almost understated by contrast.

The most striking accessory of all, however, was a diamond stomacher, a kind of lapidary bib that covered the princess's chest and stomach. We do not know exactly what Charlotte was thinking as she stood under the weight of silver, ermine, velvet, and jewels. But we know what many who saw her thought about her stomacher.