I associate the original DS more with the '60s, too. I was simply picking up on remarks other fans have made here and elsewhere about the film possibly being set in the '70s because of Ballyhoo Vintage Clothing's tweet. Though one should possibly take into account that Ballyhoo Vintage Clothing also provides vintage clothes from the '30s, '40s and '50s - and their tweet didn't specify any era for the clothing they provided. At this point we really have nothing beyond our own speculation when it comes to why the film sought out vintage clothing. And while jumping to the conclusion that the film will possibly be set in the '70s or '60s could be a very logical assumption based on their tweet and given the era the original DS' present day storylines took place, that doesn't necessarily mean that the clothes provided come from those eras or that the film is set in one of those eras.
As with so many aspects of the film, only time will tell...
(At the rate any significant info comes out about the film, I'm beginning to wonder if we should all have "Only Time Will Tell..." embroidered on pillows and displayed around our houses?
)