That’s the Victorian corset I often wear under my Victorian dresses.
I’ve bought it before I made my own corsets. It’s a modern corset, but it has the shape of an 1850s corset.
The corset is lightly boned with just enough support, and is comfortable to wear. I’ve even worn it once while bicycling. 😉
Here I’m wearing the corset with my Victorian ruffled petticoat.