Yes, I can see a more modern top too, rather than an early bra - I think that examination of the construction and identifying the materials will help.
It's an unusual piece: the fabric looks similar to '30s silk laces, the bodice style could be '30s too but the wide shoulder straps with the strap underneath: can you tell us what that is made of, please? Is it elastic or ribbon?
I wonder if it's an upcycled '30s dress, trimmed in lace and altered fairly recently ('70s-more modern). It reminds of of styles I saw in the early '90s.