The people of Naples have already been the frequent subjects of gesture studies. Online you can find here something about L’arte del gesticolare a Napoli. They also keep references to various studies.

What does this gesture mean? (source)

Andrea de Jorio wrote in the nineteenth centurey about the gestures of his fellow Neapolitans in La mimica degli antichi investigata nel gestire napoletano. It was translated by Kendon in 2000, see this online review. Essentially, de Jorio was a pioneering ethnographer, he described his own people, tried to link them historically to the Romans of classical times and so gave input to the city state’s cultural identity. All that through the study of gestures.