I believe they are simply "boater" hats. These hats are also seen being worn by gentlemen in barbershop quartets.
Gondoliers.
Gondoliers are oarsmen of the water taxi boats called "Gondolas" of the city of Venice. Thus they transport you round the canals of Venice.
The Gondoliers was created in 1891.
The Silent Gondoliers was created in 1983.
The Gondoliers - 1982 TV is rated/received certificates of: UK:E
The Gondoliers - 1990 TV is rated/received certificates of: Australia:G
Clothes
Dappy hats but their real name is peruvian hats
Tessa
Tessa
Originally called "steeple-crowned hats," witches' hats are currently just called "pointy hats."
camel hats or flap hats