Corsets should never be rolled for storage, and they should be aired laying flat, or hung by the laces over the top of a chair, with the halves of the corset on either side.
Also, it is not a good idea to let others wear your corset, as the fabric gently stretches to conform to your body as you wear it.
Be wary of washing a corset, as the metal busk, boning and eyelets may rust and stain the fabric. Dry cleaning is probably a safer option.