Mystery Fredenburg Craft: Mystery Revealed

Earlier this summer, I showcased a mystery craft (see previous post) which my Grandma had given me to complete. "Solve the craft puzzle and stay in the Haunted Castle overnight without leaving, and you get the diamonds which have been hidden inside the castle for decades," she said over iced tea and snacks.

Well, mystery revealed! Its an "over blouse", though I'm not really sure what that is.
Now I just have to stay in the Haunted Castle.

Added bonus! John Acquadro has been inspired to pen a novel about the subject, which you can see the cover now and read about later. 

Mystery Fredenburg Craft

My Grandma, pictured below, recently gave me a mystery craft project.  It is something she started 40 (50?) years ago but didn't get around to finishing.  I'm not sure what its going to look like in the end, but I'm sure it will have the world renowned Fredenburg Style that we've all grown to know and love!

There are several cut fabric pieces, shiny blue buttons and pattern instructions. The kicker is that there is no illustration of the final product. What will it look like?