On Instagram, the costume designer showed her process for creating this gown: And maybe it was inspired by this extant gown from a slightly later period: Episode two opens with Gladys rejecting that proposal, while wearing a gorgeous bustle gown that resembles another one by Worth (appropriate since her family is up with the latest French fashions)
colors, fabric, design, patterns, or borders can be tailored to your needs
- Elastic waist designed to fit multiple breeds
Rhinestone embellished block heels Pointed toe
So, depending by the occasion, as one wears also more informal versions of the suit (lighter colours, stripes, patterns, prince of wales, etc..), the same should do with more creative (and informal) versions of black tie