Vintage 1960s little mod day dress of nice black linen rayon blend most likely, maybe cotton - its a light weight yet substantial feeling slightly textured weave. Super cute and easy to wear. Collarless, boat neck, sleeveless, straight silhouette. Top stretched pleats down the front with decorative button detail. One hidden side seam pocket. Hidden back metal zip. Unlined - may want to wear with a slip for complete coverage. 
Label: none 
Fits like size: Small - See measurements to be sure.
Bust: 34" 
Waist: 27" 
Hip: 36" 
Length: 33" 
Condition: Excellent.