Simplicity 8228 Vintage Sewing Pattern, dated 1969.

Misses' Dress with Detachable Collar: 

The dart fitted, sheath dress has "V" neckline, set-in sleeves and back zipper. View 1 with two-piece collar has button trimmed tabs and below elbow length sleeves. View 2 with short sleeves has optional contrasting detachable notched-type collar, self-bow, top-stitching and belt. 

Size   12:

Bust   34 inches / 87 cm

Waist 25.5 inches / 65 cm

Hip    36 inches / 92 cm

Pattern is PRINTED, cut and checked complete. Envelope is in very good vintage condition.

More '60s patterns here:

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