XS - true to size in my opinion - cutest to wear for bridal event because it’s unique! I’m a true 4 (can size down depending on style and fit, but usually wear size 25 pant and cup size is B for reference) I’m 5’4 1/2. The tie on the corset on the back is so nice because you can tie it as tight as you want, I felt super secure in this all day. Material / quality is amazing. I only wore this ONE TIME, pictured here at my Bridal shower. I received an unreal amount of compliments. So worth it. No damage. Basically BRAND NEW.