This pattern is https://vpll.3dcartstores.com/1930s-Ladies-Dress-With-Princess-Seams--42-Inch-Bust_p_150.html from the Vintage Pattern Lending Library.
Here's a close-up of the belt.
![5693148813_fbc30bee4a.jpg](http://farm6.static.flickr.com/5144/5693148813_fbc30bee4a.jpg)
Here's a close-up of the belt.
![5693717922_6cbf61c321.jpg](http://farm6.static.flickr.com/5184/5693717922_6cbf61c321.jpg)