So from that snip you will notice that under their uniforms there's a shirt and a waistcoat, and they could push their forage cap back and it could even slip to the back left of their heads. Likely similar 'under-wear' could have been available for issue for all the Forces serving the British Empire.
ADD notice the horses are hobbled and they are also secured to the long thick cable/rope along the ground via constraints tie into equi-spaced hooks along that thick rope. My rellie says:
There should be a wheelbarrow for each horse.
Probably should refer to waistcoat as a VEST.
Each horseman was the ONLY person allowed to look after their own horse because the horse had been provided by the enlistee when he volunteered. The Australian soldiers knew their horses would not be allowed to return to Australia - Public Health rules.
The background in the OPs photo could be vineyards or ploughed land, but why would the farmers have allowed anyone to plant or plough DOWN the slope ... it causes erosion, better to plant or plough across the slope, retaining the integrity of the land, forming detention basins for rain, etc.
Yes to Lee-Enfield Mk 3 rifle.
JM
