Back in the 1940’s, you ordered a Gin & It, “It” being named after the Italian (Sweet) Vermouth used to make this drink. Sometimes referred to as Gin & Cin, named after Cinzano Aperitif (produced by Campari), a popular Italian vermouth.
This drink is classic. Not meant to be served over ice, but instead chilled and served in a coupe glass. The sweet vermouth with the Gin carries this drink and it will carry you throughout the night.