After your posts, every time I look at the photo now I see some new scenario!
I'm glad for the dating evidence, as this is starting to look like pre-WWI.
Is there a family relationship between the man in the jim-jams and the man sitting third from left, or am I just being fanciful?
Why on earth are the three whicker chairs occupied by men?
I can also see floral button-holes on about half a dozen of the men.
Ah well - perhaps we'll never know who these people are - would be fun to re-unite it with a descendent of someone on the picture, though.
Paul