Size 18 can fit smaller or bigger corset back. something blue too gave some black straps with it if wanted to add. we never added the straps. Not sure if straps can be added to it or not. I will include the straps as well. We bought at last minute and didnt have time to do any alterations No alterations. Asking half of what i paid. $300 wore less than 3 hours. Available to meet anytime this wee...