This dress is from the 30s. I found it at Old Touch and it just needed a little restoration to become wearable again. The outer fabric is transparent, as you can see on the "winged" sleeves, and it has a sewn-in underdress. Both the outer and inner layers closes with snap fasteners and hooks and eyes in the left side.
It gathers nicely underneath the bust...
...and the colors goes very well with my green Miss L Fire shoes!
There was no belt with the dress when I bought it. But I don't even think one was ever made for it. I decided to make one though, to make it fit well in my waist. Since I'm short (5'4, 162 cm), and my waist curves in pretty much, I just look even shorter if the dress just hangs straight down without following my shape. The belt makes me look at least 5'5!