This pattern is by fellow California based pattern maker, Laughing Moon. This pattern for a 1920's Robe De Style dress was based on an extant vintage garment from their collection.
The Robe De Style was a romantic 1920's fashion fad for a gown with side panniers that were sewn into the dress to make it stick out at the sides.
Pattern Information From Laughing Moon:
Pattern # 128 Robe De Style
This dress has a dropped waist, built-in hoop structure, sleeveless bodice, bust gathers and a Camisole lining.
View A has an attached Capelet for an afternoon look.
View B omits the sleeveless bodice.
View C has a ruffled skirt, ruffled bodice trim and a knotted double-loop bow attached at the waist.
View D is just the hoop slip.
All views close on the left side with snaps and hooks and eyes mounted on a placket.
Fabric:Solid or patterned organdy, batiste, voile, georgette, satin, charmeuse, taffeta or lace.
Lining: Taffeta, charmeuse, china silk. Notions: 1 Hook and eye, 5 snaps, 2 yards of 1/4" ribbon. 31/8" of 1/4" wide twill tape, View C: 2 yards 13/8" wide silk satin ribbon.
Hoop bone needed for each size.
This pattern is copied from an extant garment in the Laughing Moon Collection.