Simplicity 6496 vintage sewing pattern, dated 1976. 

Boys' Robe in Two Lengths:

The robe with shawl collar and front "wrap" closing has long raglan sleeves with sleeve bands, patch pockets and self tie belt slipped tru self carriers. V. 1 has corded piping trim. V. 1 and 2 are regular length. V. 2 and 3 are top stitched. V. 3 is above the knee.

Size 12:

Chest 30 inches / 76 cm

Waist 26 inches / 66 cm

Hip     31 inches / 79 cm

Pattern is UNCUT and factory folded. Envelope is in good vintage condition.

More kids patterns here:

http://allthepreciousthings.com/collections/baby-and-children