BERLIN, May 27 (Reuters) - German fashion e-tailer About You said on Thursday that it planned to float on the Frankfurt stock exchange, saying its appeal to younger shoppers and technology platform offered a compelling growth story to investors. The Hamburg startup, backed by mail order group Otto and Danish tycoon Holch Povlson, plans to raise 600 million euros ($731 million) via a private placement of new shares while existing shareholders would also sell stock. ($1 = 0.8205 euros) ($1 = 0.8205 euros) (Reporting by Douglas Busvine Editing by Riham Alkousaa) Our Standards: The Thomson Reuters Trust Principles.