Simplicity 7912 vintage sewing pattern ©1968. 

Misses Sleep Shirt in Two Lengths:

The sleep shirt has front band and button closing, "stand up" buttoned collar, set in sleeves, shaped lower edges and slits in side seams. V. 1 and 2 have long sleeves gathered to sleeve bands and lace or embroidered eyelet edging trim. V. 1 is ankle length. V. 2 and 3 are above knee length. V. 3 with short sleeves has contrasting sleeve bands, front back, collar and pocket. 

Size     Petite 6:

Bust    30 1/2 inches / 77 cm

Waist  22 inches / 56 cm

Hip     32 1/2 inches / 83 cm

Pattern is PRINTED, UNCUT and factory folded. Envelope has some spotting 

More '60s patterns here:

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