Here is a Simplicity Style Pattern # 1057 UNCUT Misses Gown with spaghetti straps in Sizes 6 8 10 12 14 16.
There are three gown styles all with spaghetti straps. Straight skirt. All have an attached sheer overlay that cascades down the the back center of the long dress and shows off the slit up from the bottom hem.
Fabrics suggestions: Silk & Silk types, Crepe, Crepe Backed Satin, Crepe de Chine, Double Georgette, Rayons, and Satins.
The pattern and the instructions are still factory folded. The envelope may show some wear from storage.