In 2012 Kate Spade New York opened two stores in Germany (KadeWe and Alster Haus).

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Shoppers at upmarket KaDeWe are Sie but in shops packed with young Germans even those not so youthful may be called du.

ECONOMIST: The complex etiquette of du and Sie in Germany

It has a mind-boggling mix of exclusive stores and KaDeWe in Tauentzienstrasse, the largest department store in continental Europe, will keep your credit cards busy for a while.

CNN: Berlin: Where to shop