Simplicity 9128 vintage sewing pattern, dated 1979.

 Boys' Shirt And Reversible Vest:

Top-stitched shirt has front bands, yokes, forward shoulder seams, collar and collar band, long set-in sleeves pleated into cuffs and shirt tail hem. Front and cuffs fasten with buttons of snap fasteners. V. 1, 2 & 3 have flaps fastened to pockets with buttons or snap fasteners. V. 4 has contrasting yokes, collar and cuffs. Reversible vest has optional top-stitching.

Size 12:

Chest 30 inches / 76 cm

Waist 26 inches / 66cm

Pattern is UNCUT and factory folded. Envelope is in good vintage condition with light shelf wear.

More kids patterns here:

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