Trying to find a sewing pattern or style name for this style of dess
A company that makes them, Lindy Bop, calls them their "Ophelia" style dress and they have a similar one that's called "Sloane". It's a vintage style from the 50s - "Rockabilly swing".

The description of the bodice they use in various places include:


  
  Sweetheart neckline with ruched satin inset  
  a sweetheart neckline with turquoise ruched bust panel.
  sweetheart neckline with contrasting crossover ruched bust panel
  


Google search returns a fair number of similar dresses when you search for "Rockabilly dress"... including the image that you posted, which is on a site here where they describe it as "ACEVOG Women’s 1950s V Neck Vintage Cut Out Retro Party Cocktail Swing Dresses"

Other than that, I'm not sure there's a specific name for the style.