Ha ha, most of the guys who wore them would be offended at being called gentlemen.
The photo is what they typically looked like back in the late 60s and 70s.
This is the caption for the photo below.
A stubby is a beer; specifically a short-necked bottle of beer. A stubby holder is also known as a Koozie, beer sleeve, coldy holdy, and is the thing that keeps your beer cool and stops your hands from getting cold.
B Stubbies, on the other hand, are a very unattractive design of shorts worn by older Australian men and school boys. These shorts are responsible for plumber’s crack (known as builder’s crack in New Zealand – so much so, they even have a website)
The guy on the left hand side was typical of slob/work wear and they never made fashion here, just practical in the heat or casual barbecues.
Here is a link that shows the history of the brand name Stubbies.http://www.stubbiesworkwear.com.au/about-us/
LATER : Paul Hogan in stubbies meets the queen.