buffont
An item of neckwear (a neckerchief), usually of linen, gauze, or lace, worn around the neck and puffed out over the bosom, popular from the 1750s to 1790s.
historical
A [...] white ribbon was tied round her scraggy neck, while a buffont attempted to cover her bosom as flat as a deal board, [...]
Where it comes from
From French bouffant; doublet of bouffant, which see for more.
Adapted from the Wiktionary entry buffont (CC BY-SA 4.0).