I am going to jump in here because I think you need a woman opinion. Most guys don't have a flat chest, some have moobs, some have monster pecs. What you are dealing with is perfection, in your eyes.
I should know because I chased the hourglass figure for a long time, till I realized I might have to do that forever and that just could not part of my life.
I bet you look fine with just one binder.
OK she will now return control back to the guys.