Vintage McCall’s Sewing Pattern 3204 Dress or Tunic and Pants Size 20 1/2 for Bust 43" dated 1972.
Pattern is missing one pattern piece, the pocket, but you could extrapolate piece because front dress piece shows outline of pocket. Instructions are all present. The Sleeve pattern piece has been cut to the short sleeve version but the rest of the piece is present and could be taped back on.
Description on back of envelope: Back zippered dress or tunic has front tuck. Dress A with collar or tunic C with patch pockets have button trim. Dress B has self fabric tie belt. Pants have left side zipper.