I hesitate to suggest anything Marilyn as I am sure that you have investigated it but would the shirt, as opposed to the dress, uvw work for the corset. I can't judge it well enough from the images you supplied. Worse, I have the audacity to suggest if you made it slightly shorter would the shirt uvw work? Then you could have shirt and bra and they would work in street and room.
Added… on reflection you would have to trim too much off the bottom in order to use the shirt uvw. Sorry, I'll shut up now.