Style 1273 vintage sewing pattern, dated 1975. 

Young Shape - Misses' Pinafore Dress in Two Lengths and Blouse:

Pinafore dress with raised waistline seam has lined bodice and midriff band, "V" neckline, slightly extended shoulders and back zipper. View 2 has top-stitched trim. Blouse with collar has front button fastening and long set-in sleeves gathered into buttoned cuffs. 

Size   12:

Bust   34 inches / 87 cm

Waist 26.5 inches / 67 cm

Hips   36 inches / 92 cm

Pattern is UNCUT and factory folded. Pattern envelope is in very good vintage condition, with some light paper tanning.

More '70s patterns here:

http://allthepreciousthings.com/collections/1970s