The gnaga was a carnival costume of a woman, with a cat-like mask, and a comical, sometimes offending, behaviour. It was used by men.
“Gnaga” from the Gli abiti de veneziani (1754) by Giovanni Grevembroch, translated by René Seindal.
The Venetian Carnival was celebrated for centuries, until the end of the Republic. The modern carnival is only superficially similar.