A message from Anonymous
You could wear a binder or a sports bra or something, maybe?
In all honesty, when your body undergoes changes like that, it’s not just a scale up: it changes the way your breasts sit. For example, my breasts are larger but they also sit lower on my chest because of the weight. As a result, things fit strange: Mami’s corset technically fits, but because my bra sits 1/2” lower than it used to, the top of the corset goes over the bottom of my bra cups and no longer closes properly in the back. My Batgirl suit “fits” as in I can still put it on, but because my breasts sit differently the chest is far too tight towards the bottom of my chest and almost too loose higher up. Wearing a sports bra doesn’t position my breasts properly for this, either. Likewise, there is no binder on the planet to contain me at this size — there’s simply too much tissue, and you can’t truly hide it, only displace it.
As sad as I am to “lose” a lot of costumes, the reality of it is that I’d rather just remake them to fit and flatter me than find ways to squeeze into something that doesn’t fit.