All dressed up ...

Marlene A. Eilers Koenig Collection

Marlene A. Eilers Koenig Collection

The first postcard was mailed in August 1911, and shows The Duke and Duchess of Saxe-Coburg and Gotha and Prince and Princess Alexander of Teck.  Princess Alexander of Teck and the Duke of Coburg were siblings.
Interesting costumes for the two couples.

The second postcard is of Princess Sophie of Luxembourg, one of the daughters of Grand Duke Wilhelm and Grand Duchess Marie Anne.  A formal pose at a table - inside, wearing a hat!  Sweet.