This is a polka or morris dance tune from England. The girl may refer to a ship's figurehead and blue dress to the sea. There is a sea shanty with the same name, but different tune. However, the phrase "girl with a blue dress on" is also documented in an African-American muledriver's song, and the meaning is not certain.
Ref: https://tunearch.org/wiki/Annotation:Girl_with_the_Blue_Dress_On_(1)_(The)
Ref: https://thesession.org/tunes/5762
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