You will receive a McCalls 1960 Misses' Housecoat or Duster Pattern. It is McCalls #5614, and it is missing the back neck facing pattern piece. All other pattern pieces and instructions are present and in good vintage condition.
The envelope reads "Single breasted duster or housecoat with mandarin collar or large flat collar. Unmounted, three-quarter length sleeves, with or without cuffs. Cuffs and flat collar in contrast fabric. Large matching collar and sleeves trimmed with eyelet edging. Corded piping in seam of mandarin collar and on sleeves. Pockets in side seams. "