It is fascinating that the jewels were sewn into the chemise and not the corsets. I though it might be helpful to quickly review corsets from the 1890’s to 1918 to get a sense of what the Empress’ daughters may have worn in exile. You can see a frilled chemise is worn under the corset. The wasp waste corsets that the Empress wore in the 1890’s made her the ideal of that era of straight lacing and tiny waists. An example of a wasp-waist corset for 1899 is below…
By 1900 the new mono-bosomed corsets, which the Young Empress also wore with great style, emphasized the s-curve or “Grecian Bend” that complimented the curvaceous silhouette of the period and is seen below. The new straight line corsets got rid of the tiny waists and were a bit more comfortable. You can also see that instead of wearing a chemise, the lady is wearing a lace corset cover. Corset covers were worn during the day time and removed for the deep décolleté dinner and evening gowns. These corset covers were considered by some fashion historians as the precursor of the bra...
However by 1911 the Empress refused to streamline her hips to conform to sleek new hobble skirt silhouette by wearing the new long-line corsets as seen below. Wearing the older straight front corsets made her gowns during the teens not quite as chic as they could have been with the right foundation. However the Empress always managed to look majestic in public. The new long-line corset can be seen below…
By 1913 corsets became almost girdles as seen below and therefore allowed for greater freedom. In 1913 the Wick’s Special Sports Corset was so flexible that it was suitable for even the Tango. By 1914 the Wick’s Special Sports Corset was advertised as being especially suited for Nursing and Red Cross work It is seen below…
By 1914 sophisticated women were wearing bras and cotton sateen girdles as seen below which is a fashion that the Empress’ daughter probably never wore as seen below…
You can see that from 1915 to 1918 corsets remained fairly unaltered as seen below…
The only corset I could find that might have been more in keeping with what the Empress’s daughters might have worn in exile is the 1913 “De Bevoise” even though it is listed as a boned brassiere. You can see the open-work cambric chemise under the corselet. The Empress’ daughters could not have been wearing any fashionable corset from the period as those corsets would have left their bosoms unprotected. They must have been wearing something more like the “De Bevoise” as it covers the bosom and would allow for the chemise.