This was a really nice piece that I had the opportunity to inspect. It is for an Officer of the Garde-Kürassier-Regt. (Berlin) Garde-Korps, the Rgt which was second in prestige to the famed Garde du Korps. White doeskin wool body, with a cornflower-blue band and piping.
Hat is made by the Paul Kaps equivalent of the KR, C.W. Borchert:
Cuirassier Visors in Period Photographs