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Stomacher [nave]
STOMACHER, an article of dress, Isa. 3:24.Stomacher [ebd]
(Isa. 3:24), an article of female attire, probably some sort of girdle around the breast.
STOMACHER [smith]
The Hebrew word so translated, (Isaiah 3:24) describes some article of female attire, the character of which is a mere matter of conjecture.STOMACHER [isbe]
STOMACHER - stum'-uk-er: Used to translate pethighil (Isa 3:24 the King James Version), where the meaning is uncertain. The English word denotes that part of a woman's dress which covered the breast and the pit of the stomach. It was usually much ornamented.
Also see definition of "Stomacher" in Word Study