This is a pretty sheer green organdy waist or half apron, probably from the nifty 50s. This little whisp of an apron is the classic party apron of the era- pale chartreuse green with a black floral print accent at the waist & hem. Ties at the waist with long ties. It's a cutie! 
 
Pre-owned, used; no noted stains or flaws.
 
Shown on my size M/ L vintage dress form, it's meant to be one size fits all. Actual apron measurements are--
Waistband- 22 1/2" across top of gathered apron
Side ties- 32" each
Center front length- 19" including the 3" wide waistband