bandeau

< /bænˈdoʊz, ˈbæn doʊz/.

1. a headband, especially one worn about the forehead.
2. a narrow brassiere.

noun plural -deaux (-dəʊz)

1. a narrow band of ribbon, velvet, etc, worn round the head
2. a bikini top in the form of narrow band of material

n.

1706, from French bandeau, from Old French bandel (12c.), diminutive of bande “band” (see band (n.1)).