Has anyone ever used button loop tape and buttons instead of back zipper?

I guess basically the tape goes on one side and buttons on other but any ideas how I could sew some kind of privacy flap under the seam? I mean if the loops are elastic I could see that the opening may separate and gap a little in places now and then while dancing or something.

Or...if I put in the zipper, is there a way I could cover it with a flap of fake buttons? Maybe with lace on each side of the flap?

I just really like buttons on the back of gowns, but not sure how to do it nicely.

Thanks for any advice or ideas.