Both the Sandstone and Natural are gorgeous with GH and great in the Giant Hobo style. I just sold a Giant Natural Brief and returned a Giant Sandstone Hobo! Both colours are amazing but the Sandstone will be much easier to keep clean and will go with jeans, browns, whites any neutral really. I just found it was more versatile than Natural.
If you really like a lighter colour I would keep the Sandsone now and get Ivory with GH for fall! IMO, it will be even greater than Natural