The patterns for this Butterick B6610 Copyright McCALL’S® Company, NY pattern are:

COSTUME AND HAT (WOMEN'S): Loose-fitting dress with hook-and-eye closures in the back and purchased braid. Hat lined with wire in the bottom, bow cut to the given measurements, and purchased flowers. Hat in sizes Small (55cm), Medium (57cm), and Large (60cm).
You can use materials such as:
FABRICS: A: Swiss Dot. Contrast A, plus A: Lawn, Batiste. B: Satin, Taffeta, Silk. Contrast B: Tulle. Interfacing: Buckram. Large diagonals are not suitable. *With Direction. **Without Direction.
Size guides can be found in “affiliation”