From Butterick:
Three pattern pieces, darted in front and back, with back waist and shoulder seams. Back wraps around to the front for a sheath-and-overskirt look. A: Contrast back and skirt. Bias tape finished edges.
Recommended Fabrics: Lightweight Broadcloth, Lightweight Piqué, Lightweight Linen and Taffeta.
Sizes: (8-10-12,14), (16-18-20-22)
Note: This pattern is also known as B6173, issued in 1999 and available in sizes (8-10-12) and (14-16-18).