Early Uncle Sam Patriotic costume. The red and white striped trousers measure roughly 40 X 28 and are adjustable in the waist. The Blue Coatee has applied five pointed Stars and is also excellent condition. and the white vest is also adjustable and in matching condition. The Uncle Sam Face mask is also in excellent condition and is still flexible and could be used today just like the outfit. Lastly, photos of two people wearing similar outfits. All is housed in the original Box. Excellent. Uncle Sam (which has the same initials as United States) is a common national personification of the federal government of the United States or the country in general. Since the early 19th century, Uncle Sam has been a popular symbol of the U.S. government in American culture and a manifestation of patriotic emotion. Uncle Sam has also developed notoriety for his appearance in military propaganda, popularized by a famous 1917 World War I recruiting poster by J. M. Flagg. According to legend, the character came into use during the War of 1812 and may have been named for Samuel Wilson. The actual origin is obscure. The first reference to Uncle Sam in formal literature (as distinct from newspapers) was in the 1816 allegorical book The Adventures of Uncle Sam, in Search After His Lost Honor. While the figure of Uncle Sam specifically represents the government, the female figure of Columbia represents the United States as a nation. An archaic character, Brother Jonathan, was known to represent the American populace.