Here is the white one as an example -
Perhaps it could be something on the lines of the sheer shrugs but longer with the collar not covering the nightdress.
I would actually like to see the Sheer Shrugs get a facelift.
I would also love to see robes like those from Boudoir by D'Lish, which I think is what you mean.

She also offers burlesque dressing gowns which are beautiful. Very old Hollywood glamour.
Those examples are perfect.
Aren't they? I think they'd be super popular as items.