And no, this isn’t vintage, nor is it on a specialist site for 1960s clothing. This is (amazingly) on the shelves of Topshop.
But this babydoll dress could be a period find, not least because of its wonderful paisley pattern cloth, not to mention the three quarter flared sleeves, empire waistline and high neckline. There is also some back cut-out detail with button closure and invisible zip, which you can see on the third of the images.
Sizes are XS through to L and the price is £39.