Butterick 2256 vintage sewing pattern, dated 1962.

Slimliner Dress(A) Slim skirted shirtdress with convertible collar, band cuffed long set in sleeves, self belt.(B)Full skirted version with inverted front pleats, above elbow cuffed sleeves. 

Size   18 1/2:

Bust   39 inches / 99 cm

Waist 33 inches / 84 cm

Hip    43 inches / 109 cm

Pattern is UNCUT and factory folded. Envelope has store stamp, light spotting, tears around top end.

More '50s patterns here:

https://allthepreciousthings.com/collections/1950s