1946 -Butterick Pattern No. 3726- Womens sewing pattern for misses halter neck Sun-back frock dress. For your sunny future, a one-piece halter neck sun-back frock with a deep, square neck in front, button-down back basque bodice, and full, rounded hipline dirndl skirt. The shoulder straps may be worn criss-cross as in B. Quick and Easy. (tears at corner of envelope)