I have noticed men in the hip inner suburbs wearing hats.
Suggestion: gentlemen, take off your hat when you are in a restaurant. You look like you are in a hurry. This is especially the case with boaters, fedoras, homburgs, Akubras, bowlers, trilbies and tricornes. Yes, I saw a man wearing a tricorne in a Southbank cafe once (although he might have been an actor on his way to a Gilbert and Sullivan production at the State Theatre).
Time to bring back the hatcheck.
Other recent dining out etiquette breaches here.