Emma Watson by Michael Thompson for W Magazine June/July Issue 
Macaroni wigs at the time were extremely fashionable and this led to Macaroni being a contemporary slang for foppishness/fashionable. Doodle meant idiot and Yankee was a term for Colonials. Sooooo basically the ryhme is saying “Americans are such uncivilized dickheads that they could stick a feather in their cap and think themselves fancy.”
… And why was I not taught this in school alongside the years of repetitive American history?
hey canadians brits and australians have fun at school on monday
The election posters for student president at my college were kinda dull so I let a certain someone spice things up…