According to this source, Lily Elsie’s costumes were designed by Lucile, but no source is given for Amy Evans’ dresses.
The Wikipedia article for Amy Evans is here.
From pinterest.se/brickertkin/lily-elsie/; removed monocolor tint and enlarged one quarter.
The coiffures worn by both stars have large masses of wavy hair in back. Both dresses are very décolleté.
Amy Evans: Foulsham & Banfield, May Evans, A Waltz Dream, wavy coiffure, wavy chignon, tiara, necklace, bodice, scoop décolletage, fur-trimmed quarter length close sleeves, bracelets, waist sash, natural waistline, fur-edged tight skirt, skirt ornament, gloves, shoes
Lily Elsie: Lucy Duff Gordon as designer, Lucy Duff Gordon, Lucile, Lucy Sutherland, Lady Duff Gordon, Lily Elsie, wavy coiffure, wavy chignon, bodice, scoop décolletage, quarter length close sleeves, contrasting cuffs, bracelets, waist band, close skirt