It looks similar to that set but it is actually a white beaded gown with a ruffle at the hem. This photo was taken at the Steel Pier in August 1967. I have a photo of DMF wearing these in 1966. LaVetta did tell me about a white beaded dress she designed for them and this may be what she's referring to.
The keyhole opening in the dress you are referring to were yellow beaded/sequin gowns on stretch wool. They were designed by Gene Shelly and bought at a boutique shop likely around the same time they purchased the silver peacock gowns as he designed those. Other than that photo session, I've only seen one live shot of them wearing them at an engagement Carter Baron Amphitheatre in June-July 1968.
It wasn't uncommon for them to have several sets they only wore a few times and then no longer worn. Two sets I described above are examples of that. There could be various reasons why they didn't wear them - they could have been uncomfortable, they were hot, they didn't look as good onstage as it did in a photo studio, etc. But they were also constantly updating their style so the lifespan of some sets weren't very long.
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