Simplicity 6661; ©1974; Junior Petites' and Misses' Short Dress: The top-stitched dress V.1 or 2 with shaped "V" neckline and front extension forming neck bank in back has bodice gathered at forward shoulder seams and midriff, back zipper, set-in sleeves gathered to armholes and self fabric tie ends. V.1 features long sleeves. V.2 with short sleeves detailed with gathers and optional purchased applique may be trimmed with braid or top-stitching.
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Very similar to this Burdastyle pattern
The Vintage CatUncut