Only way to do it, is to make 2 versions, with or without the belly corset but it will be a mess to do for an exact matching of the bra in both version.
@Lover @HB, you're right... I can't make them as separated items...For example, to make a bra, I can just make the bra, can't add a corset like that. So i'm using a dress base and i pretend to make the following items:- like shown (1 full piece of bra and corset to use as street clothing)- a bra (without corset and to use in room)- panties- stockings...