Please help me identify this dreamy vintage nightgown (No tags, but lots of charm!)

[eikona]

Hi vintage lovers!
I recently found this beautiful vintage nightgown and instantly fell in love with it. The only thing is… it doesn't have any brand or care tags, so I don’t know much about its origins. I’d love your help figuring out anything about it – maybe the era, possible brand, fabric guess, or any details you might recognize. Thank you so much!
With love,
Eikona.