"A waistcoat (/ˈwɛskət/ or /ˈweɪstkoʊt/; colloquially called a weskit, derived from the French veste), or vest, is a sleeveless upper-body garment. It is usually worn over ...
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a dress shirt and necktie and below a coat as a part of most men´s formal wear. It is also sported as the third piece in the traditional three-piece male lounge suit. Any given vest can be simple or ornate or for leisure or luxury. Historically, the vest can be worn either in the place of or underneath a larger coat dependent upon the weather, wearer, and setting." - (en.wikipedia.org 01.03.2020)