A vest frottoir is an instrument used in zydeco music. It is usually made from pressed, corrugated aluminium

Aluminium

Aluminium or aluminum is a silvery white member of the boron group of chemical elements. It has the symbol Al, and its atomic number is 13. It is not soluble in water under normal circumstances....

 and is worn over the shoulders.

It is played as a rhythm instrument by stroking either bottle openers or spoons down it. Many of these instruments are home-made, but Don Landry of Louisiana

Louisiana

Louisiana is a state located in the southern region of the United States of America. Its capital is Baton Rouge and largest city is New Orleans. Louisiana is the only state in the U.S. with political subdivisions termed parishes, which are local governments equivalent to counties...

 is a renowned maker of frottoirs – or rub-boards as they are also known – making them for Clifton Chenier

Clifton Chenier

Clifton Chenier , a Creole French-speaking native of Opelousas, Louisiana, was an eminent performer and recording artist of Zydeco, which arose from Cajun and Creole music, with R&B, jazz, and blues influences. He played the accordion and won a Grammy Award in 1983...

's band and Elvis Fontenot and the Sugar Bees, amongst others.