Mess jacket

The mess jacket is a type of formal jacket that ends at the waist. It features either a non-fastening double breast cut or a single-breasted version that fastens. The jackets have shawl or peak lapels. Used in military mess dress, during the 1930s it became a popular alternative to the white dinner jacket in hot and tropical weather for black tie occasions. It also was prominently used, in single-breasted form, as part of the uniform for underclassmen at Eton College, leading to the alternate name Eton jacket. A female version of it, called a spencer, was popular during the Regency period.