I found two dresses with the label "Schubert" from Paris/Beverly Hills and have not located any information on them. Any information would be amazing! The black crepe dress has an embroidered and mirrored bib. There is no size/fabric tag. The zipper is made by Talon. The green silk dress does not have a size/fabric tag. The zipper has a CC logo.
I thought of him too, but he was located in Italy and Schuberth with an h...: https://emilioschuberth.it/homepage_en/
I read that he was also in Hollywood designing for the movies so... yea, I see what you mean. Mystery!
The only thing I could find via Google was an undated set on a sales site with an identical tag: https://shopthepaperbagprincess.com/products/schubert-tan-dress-and-cape?variant=22086616154230 That green dress is such a pretty print.