So this is a size 40 but it has been altered (original was long) and it was taken in. I’m a size 6 and it fits through the hips and the waist but not at the chest. I feel like it’s closer to a six in the waist and the chest, but closer to a four in the bust. I am a 32 d and I think you would need to be an a or b for this to fit. I’m happy to take additional measurements if there’s interest as far as around the corset and around the bust to assist in figuring out the fit