There are no tags, except for what looks like may have been the ILGWU tag; there is just a sliver there now
I do believe this is a linen blend, and the accompanying scarf is a lightweight chiffon type fabric. Very well could be silk
This is a very well made, high-end garment
French darts
A-line style
Sleeveless
Built in slot for scarf
Center back zipper hidden by a panel that runs the entire length of the dress
This is giving me some peak Peggy Olson vibes.