Isn't this a cute little tummy girdle? The tag says "Poirette Originators, New York" and 35". Here is the back:
It used to have suspenders, but someone cut them off. The little floaty silk georgette petals serve as panties and the longest ones in front and back have a little pearl button and buttonhole.
Not much coverage, but fun. Probably from the 1920's. The waistline elastic has worn out, but look at those bones! The rest of the corselet is polished cotton.