This is the 1948 Siren Sundress by the Decades of Style independent pattern company. I made this from a wonderful linen that I picked up awhile ago (can't remember where!), but I love the color. The dress has a mock wrap front with long ties that you can wear two different ways in the back, and then wrap around to the front and around to the back again for a bow - they are very long ties! When selecting your fabric, be aware that the wrong side of the fabric will show on the ties.
The back of the dress wraps around and is held together with a hook and eye. There is a waist stay made with grograin ribbon that is very functional. It was a windy day when I took these pictures so you can see below how the back flap can fly open unexpectedly!
Back view with flap flying open
Another view of the back - without the flap flying open! The ties seem to work better for me if they are twisted at the center back rather than just lapping over each other. I've tried it both ways, but this way feels more secure.
Another back view
I had some major issues with this pattern. I made a muslin first to check for fit and it was terrible! I ended up completely repositioning the front and back panels - the sides I raised about an inch and then tapered to the original center front. I added bust cups and ended up sewing the front panels together to stop them gapping open.
Will I make this pattern again - not sure. Maybe if I find the right material again, but it's not high on my list at the moment.