Habergeon (n.) - a piece of armour to defend the neck and breast.
But, for to tellen yow of his array,
His hors were goode, but he was nat gay.
Of fustian he wered a gypon
Al bismotered with his habergeon,
For he was late ycome from his viage,
And wente for to doon his pilgrymage.
- Chaucer, Geoffrey: The Canterbury tales (1387-1394)
The Middle-English Word of the Day is selected from Mayhew and Skeat's
"Concise Dictionary of Middle English."
As found on Greg Lindahl's website
The example text was found at the Middle English Collection of the University of Virginia Library.