Period costumes and thirteen stars on the flag could it be a precursor to the Betsy Ross flag?
https://en.wikipedia.org/wiki/Betsy_Ross_flag
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Pre Betsy ross flag.
Betsy Ross (1752–1836) was an upholsterer in Philadelphia who produced uniforms, tents, and flags for Continental forces. Although her manufacturing contributions are documented, a popular story evolved in which Ross was hired by a group of founding fathers to make a new U.S. flag. According to the legend, she deviated from the 6-pointed stars in the design and produced a flag with 5-pointed stars, instead. The claim by her descendants that Betsy Ross contributed to the flag's design is not generally accepted by modern American scholars and vexillologists.
https://en.wikipedia.org/wiki/Betsy_Ross_flag