Blue & White Polka Dot drop waist top with cotton striped band at the bottom and striped sleeves and polka dot elastic pleated skirt
It looks like the lace collar has been added- See Photos 
 
~ NO SIZE TAG
~ Button & Snap in back
~Union Label - Red, White & Blue label - Era- 1974-1995
~Made in USA 

Measurements:
Top - Chest 22.5",  Sleeve length 11",  Shoulder to Shoulder 17", Shoulder to Hem 27"
Skirt - Waist 15", Waist to Hem 32"