I recently came across a Christian Dior Wrap-Around, it seems to be a vintage piece and has the tags still attached. I will put everything that I can see to help identify it, im hoping someone can tell me what year this is from and maybe a value of it? I figured a Dior fansite, someone will know its worth. Ok so on the tag is says Christian Dior "Robe De Chambre" New York/Paris.

On the flap of the page inside it says 85% ARNEL TRIACETATE 15% Nylon WRAP AROUND 8540 3 35 248 A ONE ...

any help would be appreciated, or point me towards a site I could maybe find the info? Thanks again