70s/80s nylon tricot nightgown by Vanity Fair.  Color is a blue tinted green, not as blue as it appears in most of the photos.  The photo showing the tag is closest to its true color.  Material is opaque, silky and quite stretchy.  Tag is labeled a small but it will fit a variety of sizes.  It's shown on a 2 but will accommodate a larger bust due to the cut and stretch. It's cut straight and has an attached cord to cinch the waist (or not, as desired). Excellent condition.
Bust: 33" flat, stretches to about 36" easily
Length: 54. 5"
13" from shoulder to cord under bust 

This item is sold from a vintage boutique in Los Angeles, Ca.