I was cleaning out my stuff and ran across this little mystery. It's quite fancy for a slip. I believe those are French seams along the sides and raw edges elsewhere, and the embroidery looks the same inside and out. The label is bare, nothing on it so I didn't bother trying to get a better pic of it. No other labels anywhere.
Do you the fabric composition please? It seems to be shiny so I'm thinking nylon. Can you tell us how long it is? It could be late '40s but is more likely '50s or '60s. It will help if we know the fabric and length.
I'm not sure what the fabric is. It's not like anything else I have familiarity with. It feels like a sort of silky thin polyester only its sheer. It's knee length on me. Another thing - it has no hardware on the straps. No adjusting the length.
