What's Penny Wearing? #119 Something Long, Cool and Vintage

I found this vintage home-sewn dress at an estate sale:

 It's long, because...well - because it's long, see here:

 Those streaming sashes in the back extend below the hemline!
 Nice detailing with the little bow and the "streamers" at the back:

  It's cool because it's sleeveless:

 And also because it is made of linen or cotton:

 And it's vintage because...
...well, I am just certain that it IS - and that makes it kind of "cool", as well!
I wish I could find out which pattern it was made from, I would certainly love to add a photo of that, here.
If I should ever come across a vintage pattern  that looks like this, I will do just that.