What is a "nappe" in French?

The family hat. John bought it for Mom, in Mexico. Mom left it to me, in France. Marsha borrowed itin St Remo, and yesterday, while sitting out in the morning sun enjoying our coffee together, Dad asked: may I use your hat?

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une nappe (nap)

: tablecloth, sheet (layer)

la nappe phréatique = ground water, water table
la nappe de mazout = oil slick
la nappe de brouil...