The polka dot is a leftover from the polka dance craze that was introduced to America in 1835.
Polka is the Polish word for “Polish woman,” but the dance came from Czechoslovakia, just like the song “American Woman” came from Canada.
The dance was in vogue up until the end of the nineteenth century, during which time dozens of by-products capitalized on its popularity, including one that still lingers: wearing apparel with the polka dot pattern.