This may not be a Luile dress.
From Prometheus2011's photostream on flickr detint.
Lily’s dress is typical early 1900s with a shallow vee waistline created by a waist band. The over-bodice overhangs the waist band in almost blouson style.
Keywords: 1907, Foulsham and Banfield, Lucy Duff Gordon as designer, Lucy Duff Gordon, Lucile, Lucy Sutherland, Lady Duff Gordon, The Merry Widow, Lily Elsie, wavy bouffant coiffure, feathered brim hat, under-bodice, high enclosing neckline, necklace, pouter pigeon over-bodice, vee décolletage, elbow length full sleeves, ruffled cuffs, waist band, shallow vee waistline, close skirt