Butterick pattern 4831.
Misses / Misses' Petite Dress.
Dress, below mid-calf or lower calf, has neckline variations, extended shoulders, shoulder pads, loose fitting, slightly blouson front bodice, elastic ( Seamed) waist, straight or flared skirt, back zipper and above elbow or long sleeves.
The pattern does appear to have been used. All the cut pieces appear to be present and the instructions are in the envelope. I have not unfolded the pattern.
Envelope shows wear from age and tear from age and being stored.
The pattern you receive is the one in the photo.
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