No Australian Slouch Hats in Submarines!

1 minute 38 seconds in - the side of a slouch hat is pinned up for fashion or to facilitate rifle drill.

2 to 5 min - slouch hats used in Europe and the US Civil War. Slouch hats in action are wide brimmed
                      and unpinned to keep the sun and rain off.

8 min 7 secs onwards - Australian slouch hat (ASH) history.

8m 10s - ASH in Boer War and more detail 

10:07 - ASH in the "Great War" ie WWI. A combination of ASH and other hats at Gallipoli, 1915.

11:22 - ASH in WWII

12:02 - ASH today

I used to wear a slouch hat in the Australian Army Reserve, although I was not a very good soldier (I couldn't do things automatically). Dad was a much better soldier - here wearing an Armoured Corps black beret. 

P.S. There seem to be no biographical details on the Internet for "The History Guy" wonder why?

P.P.S. Submarines lack headroom. So hats are more a submarine movie and/or PR thing? And there is now very little sun - keeping in the shade - worry. 

Pete