No, Ken is right. I now think the jacket is the 1902 pattern British tropical issue. It actually survived into WWII. Patch pleat breast pockets only. Two of the three men are wearing what appears to be webbing belts which makes them British. So, it comes down to the helmet badges. I don't know what they were, New Zealanders had a similar badge. I don't know whether there were British or Commonwealth troops in Italy in WWI.