Butterick 5936; ca. 1951; Lounging Ensemble or Day Length Housecoat. (A) Knee-length housecoat and slim trousers make the perfect at-home ensemble. Housecoat has a convertible neckline, can serve as an over-everything robe. (A1) No side seams; pockets inserted in darts. (B) Lounging pajamas.