This jacket is based on the common sack jacket of the 1900s.
The coat first appeared in 1840's France and quickly spread to Britain and the United States. Originally used for informal occasions, it soon became the work and business clothes of technical workers and staff. By the end of the 1850s, the U.S. military used it for routine military clothing. By the 1870s, people in the western region had worn sack jackets as general outdoor clothing and work clothes.
Although there were many forms of suits at that time, including the dressed-down tuxedo and the cozy blazer, the most commonly worn Jacket was the Sack Jacket, which almost replaced the morning suit and could be worn at all daytime events except weddings, funerals and high-class social events. Like the top hat, the Sack Jacket was daily worn. In the late 19th century and early 20th century, the Sack Jacket was commonly worn with only the top button on, the bottom completely open, and a small lapel.
Although the Sack Jacket was considered by many to be suitable only for working-class people, its simple cut and conservative style has become a staple of western business attire in more than a century.
