Jabot

JABOT, zha bo', ja- n 1. a fall of lace or cloth attached to the front of a neckband and worn especially by men in the 18th century 2. a pleated frill of cloth or lace attached down the center front of a woman’s blouse or dress (Webster)

A fall of cotton, silk or lace worn at the throat to conceal the closure of a man’s shirt (seventeenth century) or as a finish to a lady’s blouse (nineteenth century). (Encyclopedia Of World Costume, Jabot)