Butterick 3183 vintage sewing pattern, dated 1993.

Misses' Wedding or Bridesmaid Dress:

Close-fitting, lined dress, lower calf or floor length, has armhole binding, flared skirt with side front and side back seams, no side seams, bias flowers, back button/loop and zipper closing and above elbow or long sleeves with stiffening at cap and shaped lower edge. View A and B heart shape back cut-out. 

Size:    8 10 12:

Bust:   31 1/2 - 32 1/2 - 34 inches / 80 - 83 - 87 cm

Waist:  24 - 25 - 26 1/2 inches / 61 - 64 - 67 cm

Hip:     33 1/2 - 34 1/2 - 36 inches / 85 - 88 - 92 cm 

Pattern is uncut and factory folded. Envelope is in good vintage condition, with some tears around the opening.

More 80s patterns here:

https://allthepreciousthings.com.au/collections/1980s