McCall's 7278 vintage sewing pattern, dated 1964.

Girls' Separates: Overblouse, Top, Pants & Shorts:

Top is lined, trimmed with machine stitching, buttoned at back. Dart fitted shorts or long pants have left side zipper closing. Overblouse has 3/4 length set in sleeves, vents in side seams, slashed front neck opening and one piece interfaced collar with pointed ends. 

Size    12:

Breast 30 inches / 76 cm

Waist   25 inches / 64 cm

Pattern is cut and checked complete. Envelope has wear and tear, flap removed, store stamp on the front.

More children's patterns here:

http://allthepreciousthings.com/collections/baby-and-children