So apologies if this is old news…
In the age old “did Venetians fake the camicia underneath the CF/ladder laced bodices” debate — check out this painting by Montemezzano (done between 1560-1610). It looks to me very much like she is wearing a faux-camicia, given the strong line at the top and how it looks like it’s folding over; with a real camicia underneath.
Of course, I don’t think this is at all evidence for corsetry, or even evidence of anything beyond, “Hey, this one painting suggestings a false front.” But I do think it lends credence to the possibilty of an under-kirtle, bust band, or something (maybe even just the real camicia) that is being covered by a false camicia front.