Maggie McNaughton Vintage Black Sleeveless Maxi Dress. 
Plus Size 1X.
Asymmetric detail near bottom of dress.
Fabric is polyester and does remind me more of a nylon type nightgown or lounge dress.

Good condition overall. Just a few small snags. Minor fading at the underarm where the side seam meets.

Pit to pit is 24" and stretches to 27" for a full bust of up to 54".
Hip to hip is 24 1/2" and stretches to 28 1/2" for a full hip of up to 57".
Length is approx 50" from shoulder to hem and will fall as more of a midi dress if you are on the tall side.

This is from a smoke free, pet friendly home. It has been washed and lint rolled.