Today's theme is:
Men with their hands in their pockets - My Dad in Dublin around 1950.
In both photos he has a knitted vest underneath. The shirt style in the second photo is very different, it seems to be a tab collar (has a small tab that fastens the points together underneath the knot) since he has a tie pin on.
If it was a pin collar I would assume you wouldn't wear a tie pin.
In looking through 1950 photos online it appears most men wore hats. I don't think my Dad ever did.
I believe he is standing in the front door of his house on Mourne Rd in Drimnagh. My aunt continues to live in this house.
More men with their hands in their pockets.
Image and information below from A history of men's' suits.
The 1900s started with a sack coat is officially defined as a 'man's hiplength coat with a straight back'. This is not to be confused with the lounge coat.