A guimpe is a short blouse with sleeves worn under a pinafore dress. The term is also used to describe a piece of starched cloth covering the chest and shoulders of a nun's habit. Found on http://www.probertencyclopaedia.com/browse/PG.HTM
a chemisette or yoke of lace, embroidery, or other material, worn with a dress cut low at the neck. · gimp. · a part of the habit of nuns of certain orders, consisting of a wide, stiffly starched cloth that covers the neck and shoulders. Found on https://www.infoplease.com/dictionary/guimpe