From Wikipedia; their contributor Wolfgangus Mozart had removed the original sepia tone and cropped the original post card. Spots removed from background by gogm.
Pauline's dress has a deep vee neckline created by a pleated bodice and lace bertha, filled in by a modesty piece. Wikipedia dates this to ca. 1875; the big bustle and drapery say ca. 1873. Her dress has a cuirasse bodice that rides atop her bustle.