Simplicity 5262; ca. 1960s; Simple to Sew blouse features a bateau neckline and back zipper closing; fitted in front with diagonal underarm darts. View 1 has below elbow length sleeves and optional tie belt. View 2 is sleeveless. Blouse in both Views may be worn as overblouse or tucked into skirt. Reissued in the 2010s as Simplicity 1364.
Links to reviews/blog posts Edit
[insert your photos of this pattern made up]