Hats - but whose?

My job of organising inherited family photos continues, as does the frustration of so many of them being unnamed. These four fine women of the mid to late 19th century probably lived in, or near, Bathurst in New South Wales. Their surnames could have been Hale or McGann. I wonder if the two photos on the left are of the same person or, perhaps, they were sisters. One thing we do know about them is that they liked hats.

In the extreme offchance that you recognise any of them, please do tell me.