Butterick 5612 vintage sewing pattern, dated 1987.
Very loose-fitting blouse has collar, back yoke with slightly forward shoulder seams, shaped hemline and above elbow sleeves with cuffs or long sleeves with button cuffs. Narrow hem. A: front tucks and appliques. C: contrast collar. Purchased trim.
Size A: 8 10 12:
Bust: 31 1/2 - 32 1/2 - 34 inches / 80 - 83 - 87 cm
Pattern is uncut and factory folded. Envelope is in good vintage condition, with a small scuff mark on the front.
More 80s patterns here: