Simplicity 5421 Vintage Sewing Pattern, dated 1964.

Teens' One-Piece Dress:

Princess Line dress has bust darts, a scooped neckline and a back zipper closing. V. 1 features short, set-in sleeves. Self fabric tabs with buttons extend from each side front seam. V. 2 is sleeveless with patch pockets. 

Size  12T ( teen ):

Bust  32 inches / 81 cm

Waist 25 inches / 64 cm

Hip    34 inches / 86 cm

Pattern is UNPRINTED, checked complete. Envelope is in good vintage condition, with wear and tear to corners and opening.

More '60s patterns here:

http://allthepreciousthings.com/collections/1960s