Simplicity 1031 vintage sewing pattern, dated ca 1955.

Junior Misses' and Misses' One-Piece Dress: 

This easy-to-wear dress buttons from neckline to hem and features a low rounded neckline.  The wide collar may be trimmed with braid, view 1, or be of contrasting fabric, view 2.  View 3 is collarless.  All views have short kimono sleeves.  The flared skirt may be worn with stand-out petticoats.  View 3 buttoned sleeve tab, neck, right front closing are detailed with braid. 

Size   11:

Bust   29 inches / 74 cm

Waist 23.5 inches / 60 cm

Hip    32 inches / 81 cm

Pattern is PRINTED, cut and checked complete, in good condition. Envelope has small splits on corners, edges and opening.

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