Simplicity 5576 Vintage Sewing Pattern, dated 1964.

Misses one piece Dress with detachable collar:

Features a front yoke, jewel neckline, set-in sleeves and a back zipper closing. Front gathers to fit the yoke. A self fabric tie belt or purchased one may be used. V1 sleeves are long. The detachable collar is of contrasting fabric. V2 dress has short sleeves. 

Size  14:

Bust  34 inches / 87 cm

Waist 26 inches / 66 cm

Hip    36 inches / 92 cm

Pattern is UNPRINTED, checked complete, tissue in good condition. Envelope is in very good vintage condition, with store stamps on the front.

More '60s patterns here:

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